Poisson and negative binomial regression SPSS (June 2023) Mike Crowson 2023-06-28 | In this video, I provide details on how to generate and interpret results from both Poisson and Negative binomial regression models (both of which are used when the dependent variable is a low frequency count outcome). You can download a copy of the dataset used in the video here: drive.google.com/file/d/1adLHhF5MyG70eD4Pbe85GZ468IvcpsPN/viewDownload a copy of the Powerpoint referenced in the video here:drive.google.com/file/d/1ztGz272IAH0TaeDZOu8laGlrM89Y_2xj/viewDownload Excel file here:drive.google.com/file/d/1gkaNAOLMFxr5QwGXokUsYlWgy9rb75_2/viewVideo on zero-inflated Poisson and negative binomial regression using SPSS: youtu.be/wfAHgSjnwgcCheck out other videos and resources at: sites.google.com/view/statistics-for-the-real-world/home
Modeling multicategorical outcomes in SPSS 29 using multinomial logistic regression (Sept 2023, rev) Mike Crowson 2023-09-18 | This video demonstrates how to perform a basic multinomial logistic regression using SPSS version 29. A copy of the SPSS data file can be downloaded here:drive.google.com/file/d/1QolBbgNqXbECaqGRV7NKLdeJm9D6Szcj/view A copy of the Powerpoint file referenced in the video can be downloaded here:drive.google.com/file/d/1DOsZkayTqae1p5oACKKiNeYO5r5ZuE9f/viewA copy of a Word document with an example write-up can be downloaded here:drive.google.com/file/d/1LCKRROFUhySHdhEXQRo1vogjgnA-NiOn/view
Repeated measures ANOVA with two within-subjects factors SPSS 29 (Sept 2023) Mike Crowson 2023-09-04 | This video provides an example of how to perform repeated measures ANOVA with two within-subjects factors using SPSS version 29. A copy of the data can be downloaded here: drive.google.com/file/d/1pQ_yom_rOvvjSS5o7UDdeeRWI5IK95y6/viewSupplemental powerpoint: drive.google.com/file/d/1lu9ZsSeEgbgzjQvxVsHFAP_pix5C2PZc/view
Confidence interval for sample proportion SPSS 29 (Sept 2023; rev.) / see links in video description Mike Crowson 2023-09-03 | This video demonstrates how to generate sample proportions and confidence intervals for those proportions using two different routes in SPSS 29. Download a copy of the data used in this video here:drive.google.com/file/d/1YvzbAtbH5WKwHKRU72kZaMz1bZolBeUA/viewSupplemental Powerpoint: drive.google.com/file/d/1rya2-2sjmte7L-H-aeZQ-ki5G6X3eprZ/viewHere is a nice discussion of different confidence intervals for proportions:towardsdatascience.com/five-confidence-intervals-for-proportions-that-you-should-know-about-7ff5484c024f
Binary logistic regression using SPSS 29 (Part 2; August 2023) Mike Crowson 2023-08-30 | This video continues my previous discussion on binary logistic regression found here: youtu.be/h1yljWlvGR0In this video, I provide a somewhat more complicated model that involves a multicategorical predictor variable. A copy of the SPSS data file can be downloaded here: drive.google.com/file/d/1AG_pYEBeVtOv9lvscw7WKvbG9owkEP7i/viewA copy of the Powerpoint referenced in this video can be downloaded here:drive.google.com/file/d/1T2fDn40aXmAMgKkWMHfUfMSs5RDOMj00/view
Binary logistic regression using SPSS 29 (Part 1; August 2023) Mike Crowson 2023-08-30 | This video provides a demonstration of how to perform binary logistic regression using SPSS version 29. I discuss a couple of routes for generating output and discuss results. Download SPSS data here: drive.google.com/file/d/198ICLWAzSv650K2GogKEQOQyuzWC685f/viewDownload a copy of the Powerpoint here:drive.google.com/file/d/1eNj5ih0eV-XYrX4L4M9nNjlDy51wNyrM/viewI have a second example with a more complex model I created as a Part 2 in this series here: youtu.be/bV1wIBgF5IA
Confirmatory factor analysis (CFA) using jamovi (August 2023) Mike Crowson 2023-08-21 | This video provides a walk-through of two routes by which you can test a confirmatory factor analysis using the jamovi open source statistical program (which can be downloaded here: jamovi.org/download.html ).A copy of the SPSS data (no missing values) can be downloaded here: drive.google.com/file/d/1qydlpGKb9lHu6OCNOPJ5jNFBCMhj1HbN/viewA copy of an Excel file version of the same data can be downloaded here: drive.google.com/file/d/1hNkrxu-AylwCyLtCHKPGHPFW4boExSdd/viewSPSS file with missing data: drive.google.com/file/d/1dpXmMfj1it02abuhDIIgiEJKcYXT-d05/viewExcel file with missing data:drive.google.com/file/d/1jiBZnzjYv4oIyV_6mTPkt6mkQmJ0q-fZ/view A copy of the Powerpoint referenced in the video can be downloaded here:drive.google.com/file/d/1ge2Sg2M-ptp0y8nRpNWwSXnAMxrYkWol/viewPlos One article: journals.plos.org/plosone/article?id=10.1371/journal.pone.0173295My previous EFA presentation on EBI from this article: youtu.be/-rJ34R9ZVbI
Custom mediation models using Process macro with SPSS: An introduction (August 2023) Mike Crowson 2023-08-17 | This video provides a discussion of how to test customized mediation models using Hayes Process macro. Customized models necessarily require the use of Process syntax. I begin the demonstration by running an analysis using the drop-down interface in SPSS. Next, I demonstrate how to generate the same results with the 'model' option using Process syntax. Following, I introduce you to the bmatrix option and how to specify effects using this option in your Process syntax. After provide a general introduction, I walk through a three additional models demonstrating how to think about the use of the bmatrix command when specifying your model. Download a copy of the data here: drive.google.com/file/d/1x8IC8Iup1RQqh-nnNj2v5VydUN2eq0Br/viewDownload a copy of the Powerpoint here: drive.google.com/file/d/1NtwSSWgQlY6TYxf_lzD1aRbWVe5qOF4K/viewText file containing syntax associated with the models tested in the presentation:drive.google.com/file/d/1__GTfmy8wnOXTvhvfhEwLN5Pf-1gXH4A/viewFor more videos and resources on using Process, please check out:sites.google.com/view/statistics-for-the-real-world/contents/process-macro-mediation-and-moderation
Addendum to video on simple and parallel mediation Mike Crowson 2023-08-16 | This video demonstrates how to use the Process syntax to generate the output discussed in my previous video on simple and parallel mediation. Go HERE (youtu.be/VaeK3U3Deck) to for review of mediation concepts and examples and output. You can download this text file for further study of the syntax discussed in the video: drive.google.com/file/d/1e197GRk836DStShrm1yqYedeyUKDjRmY/viewFor more videos and resources on using Process, please check out:sites.google.com/view/statistics-for-the-real-world/contents/process-macro-mediation-and-moderation
Mediation analysis using Process Model 4 in SPSS (Simple and parallel mediation; Aug 2023) Mike Crowson 2023-08-16 | This video discusses some of the basics of mediation analysis and demonstrates how to perform simple and parallel mediation analysis using the Process macro (Template #4). Download a copy of the data used in the video here: drive.google.com/file/d/1x8IC8Iup1RQqh-nnNj2v5VydUN2eq0Br/view Download a copy of the Powerpoint referenced in the video here:drive.google.com/file/d/1CsFn_4QZGm9vnjGsNz_5L6stdixf_04-/viewVIDEO ADDENDUM on using Process syntax: youtu.be/9tB-WDTfKnk Link to Plos One article: journals.plos.org/plosone/article?id=10.1371/journal.pone.0171673If you do not have a copy of Process, here is a video of how to obtain and install the macro for SPSS: youtu.be/yTiSbVKbYOoFor more videos and resources on using Process, please check out:sites.google.com/view/statistics-for-the-real-world/contents/process-macro-mediation-and-moderation
Process model 7 in SPSS using syntax (addendum to previous video on first-stage moderated mediation) Mike Crowson 2023-08-14 | This video is an addendum to this video (youtu.be/NQkou0x6LyY) on Testing first-stage moderated mediation using Process with SPSS. The previous goes into depth on how to utilize the Process macro drop-down menu system. This video shows you how you can obtain the same results as with the drop-down system using syntax. It also shows you how to set the seed number so that the lower and upper bound of bootstrap confidence intervals will match across replications (assuming the same model specifications) by setting a seed number.For more videos and resources on using Process, please check out:sites.google.com/view/statistics-for-the-real-world/contents/process-macro-mediation-and-moderation
Process model 7: Testing first-stage moderated mediation using Process with SPSS (Aug 2023) Mike Crowson 2023-08-14 | This video begins with an introduction to the basics of understanding first-stage moderated mediation. Next, it provides an example of how to perform this analysis using the Process macro with SPSS. A copy of the data can be downloaded here: drive.google.com/file/d/1uc-zswDg2ajdIyNUtmaJthThvbsSoOfH/view A copy of the Powerpoint referenced in the video can be obtained here: drive.google.com/file/d/1huFdf3FaQBNzc8FCFMj5bbaneaLbdCin/view Addendum to this video on using syntax (including setting seed value) here: youtu.be/Lzg20qD-tIMIf you do not have a copy of Process, here is a video of how to obtain and install the macro for SPSS: youtu.be/yTiSbVKbYOoFor more videos and resources on using Process, please check out:sites.google.com/view/statistics-for-the-real-world/contents/process-macro-mediation-and-moderation
Zero inflated Poisson and negative binomial regression using SPSS extension (June 2023) Mike Crowson 2023-06-29 | This video walks you through the basics of running and interpreting a zero-inflated Poisson and zero-inflated negative binomial regression model using an extension for zero-inflated count models.For a refresher on Poisson and negative binomial regression in SPSS go here: youtu.be/wBGprqJJlTUIf you need to know how to download and install the SPSS extension, go here: youtu.be/0MVoyU6lpGwYou can download a copy of the SPSS data for our example here:drive.google.com/file/d/1fV0yy2-mMvbfRTtGg19h-nzzZcSNVEoN/viewDownload a copy of the Powerpoint I refer to in the video here:drive.google.com/file/d/15vcANCcf7GG8lEoxMus8Ztm6oFZwtRbQ/viewDownload copy of the Excel file (for computing exponentiated coefficients) here:drive.google.com/file/d/1D7agRLLwZQiwcYg2MFFHP4kFvT-Y0yFC/viewCheck out other videos and resources at: sites.google.com/view/statistics-for-the-real-world/home
SPSS extension for zero-inflated count (i.e., Poisson and negative binomial) regression models Mike Crowson 2023-06-29 | This video provides a short overview of how to obtain an extension for SPSS to perform a zero-inflated Poisson or negative binomial regression. I also discuss some general characteristics of the interface.To see my video on zero-inflated Poisson and negative binomial regression models using this SPSS extension, please go here: youtu.be/wfAHgSjnwgcIf you would like a brief review of standard Poisson and negative binomial regression using SPSS, check out this video: youtu.be/wBGprqJJlTUCheck out other videos and resources at: sites.google.com/view/statistics-for-the-real-world/home
Poisson regression using Stata (June 2023) Mike Crowson 2023-06-22 | This video provides a demonstration of Poisson regression in Stata where you have multiple predictors. A copy of the Stata data file can be downloaded here: drive.google.com/file/d/1Q0JjFEJUHYMXrVf9kk2NhAX0RXiHH-TV/viewA copy of the Powerpoint I referred to in the video can be downloaded here:drive.google.com/file/d/1gWnm4Xy2A0M2XxWffDAm_wg2caLWvSBc/viewCheck out other videos and resources at: sites.google.com/view/statistics-for-the-real-world/home
Exploratory factor analysis using RStudio and EFA.dimensions package (video accompanying blog post) Mike Crowson 2023-05-30 | In this video I first point you to the following blog posting on exploratory factor analysis using the EFA.dimensions package with RStudio:mikesquanthub.blogspot.com/2023/05/factor-analysis-of-ebi-items-tutorial.htmlNext, I provide an overview of how to generate the output shown and discussed in the blog posting. Download a copy of the Excel file referenced in this video here: docs.google.com/file/d/1qMLAmjxjjWyKvwAT4qv2wNhgV9059xbo/view
Comprehensive tutorial: Exploratory factor analysis using SPSS (see links in video description) Mike Crowson 2023-05-25 | This video tutorial walks you through an example of exploratory factor analysis (EFA) using SPSS. In this video, I begin by showing you how to assess the factorability of the correlation matrix, then proceed to approaches for determining the number of factors, and then final extraction, rotation, and interpretation of factors. I illustrate how to identify thematic content in items when naming the factors. Download a copy of the data used in this video here:drive.google.com/file/d/13n905vAwXDlUWFbrYEV0HFalJnRwCz00/viewDownload a copy of the syntax file referred to in the video here:drive.google.com/file/d/1Zof__tq89Yys9o7MV1AxvkV4-fPP7-NP/viewDownload SUPPLEMENTAL POWERPOINT here: drive.google.com/file/d/1QD3mp-0fjIYP95IM7CU7gLwEA3PTzDyW/viewSee also:mikesquanthub.blogspot.com/2023/05/exploratory-factor-analysis-with-spss.htmlTo access the original article referred to in the video, go here:journals.plos.org/plosone/article?id=10.1371/journal.pone.0173295#sec013
Determining number of factors: Exploratory factor analysis (EFA) using RStudio and EFA.dimensions Mike Crowson 2023-05-17 | This video provides a demonstration of how to use the EFA.dimensions package with RStudio to make a determination of the number of factors that may explain the intercorrelations among a set of measured variables. I use an example and data from journals.plos.org/plosone/article?id=10.1371/journal.pone.0173295 .A copy of the Excel data file can be downloaded here: docs.google.com/file/d/1Q8H43VIWGR11YrMqQ4pUMsDis9datNYj/viewA copy of the Powerpoint slides I reference in the video can be accessed here:docs.google.com/file/d/11jMov52G7q04CMqtFrQglbqw8nlG61Kx/viewA text file containing the code used in this video can be downloaded here:drive.google.com/file/d/1b9UJ8XNcgKvN_YfTeBaLoYBWuI3hFt4Q/viewLink to EFA.dimensions documentation:cran.r-project.org/web/packages/EFA.dimensions/EFA.dimensions.pdfBe sure to check out my blog, where I discuss the issue of over- and under-factoring:mikesquanthub.blogspot.com/2023/05/Possible consequences of over- versus under-factoring.html
Process model 7 (first-stage moderated mediation) using R Studio Mike Crowson 2023-05-16 | This video provides a walkthrough of how to generate output for testing a model containing first-stage moderated mediation using the Process macro with R Studio. The model template number of this analysis is 7. In the context of my discussion I offer commentary on various pieces of the output and demonstrate how to plot simple slopes using the ggplot2 package. You can download a copy of an Excel file containing the data here: docs.google.com/file/d/16gC6BXIKxQTudX5ENdwli3gtGS1b7HRd/viewText file containing the commands used in the video:drive.google.com/file/d/1lIEFWlxhGFT1EY2xJc00qlV3DPImpBvY/viewI provide annotated output (for those of you who seek deeper coverage) here:mikesquanthub.blogspot.com/2023/05/process-model-7-using-hayes-process.htmlGo here if you need further guidance on obtaining and activated the Process macro: youtu.be/__ix6-kwJM8Demo of simple mediation using Process macro with RStudio: youtube.com/watch?v=Id6zjPZoKvo
Downloading and activating Hayes Process macro for RStudio Mike Crowson 2023-05-16 | In this video, I provide a short demonstration of how to obtain a copy of Hayes Process macro and how to activate it for use with RStudio. Here the link to the Process macro website (in addition to the site pointing you to the download location, it also provides additional detail on the macro you might find useful): processmacro.org/index.htmlHere is the link to the final download location:haskayne.ucalgary.ca/CCRAM/resource-hub
Parallel analysis for SPSS users (Part 1) Mike Crowson 2023-05-12 | This video is designed to provide a walk-through of how to perform parallel analysis when conducting exploratory factor analysis (EFA) in SPSS using a web utility at https://analytics.gonzaga.edu/parallelengine/ . The video is designed to supplement to the presentation on the topic found at:mikesquanthub.blogspot.com/2023/05/parallel-analysis-with-spss-to.htmlA copy of the data used in this video can be downloaded here:drive.google.com/file/d/1mcWpNm9V8vx99j_RSCXniZSEsSs8h5nD/view
Determining number of factors in SPSS using Velicers MAP Procedure Mike Crowson 2023-05-09 | This video demonstrates how to perform the MAP procedure in SPSS to determine the number of factors using O'Connor's syntax. The data file in this video can be downloaded here:drive.google.com/file/d/1UU1grgUNrvSLrSPdjctq1vb_clywOcy4/viewThe following is the link to O'Connor's website to download the syntax file:oconnor-psych.ok.ubc.ca/nfactors/nfactors.htmlDownload a copy of the article reference here:link.springer.com/article/10.3758/BF03200807My video on parallel analysis using SPSS with O'Connor's syntax:youtube.com/watch?v=AKE49mHkoKo
Converting numeric into factor variables in R Studio (includes adding labels to factor levels) Mike Crowson 2023-02-28 | This video demonstrates how to convert numeric into factor variables. I begin by creating a small data frame in R Studio. From there, I walk through steps for converting numeric variables into factor variables, and also how to add value labels that will show up in your output. Link to R script file from video here: drive.google.com/file/d/1vqbn8bhDSdwUVXcSP2aZ7ieS7Speu-0z/viewAdditional link:drive.google.com/file/d/1oP1MA2SjQXKHgtERvjZMsldgDLPlTgXY/viewBe sure to check out my online sites at:drmcstats.netsites.google.com/view/statistics-for-the-real-world/home
Downloading and installing Hayes Process Macro for SPSS (2023) Mike Crowson 2023-02-28 | In this video, I demonstrate how to download and install Hayes Process macro for SPSS. The links to the websites referred to in the video are: processmacro.org/download.htmlhaskayne.ucalgary.ca/CCRAMhaskayne.ucalgary.ca/CCRAM/resource-hubFor more on Conditional Process Analysis with SPSS:sites.google.com/view/statistics-for-the-real-world/contents/process-macro-mediation-and-moderationBe sure to check out my online sites at:drmcstats.netsites.google.com/view/statistics-for-the-real-world/home
Dropping and subsetting variables from dataframes in R Studio (see links under video description!) Mike Crowson 2023-02-25 | In this video, I spend time discussing how you can create smaller data frames (in terms of number of variables) from larger ones by dropping variables are using subsetting of variables. I begin by discussing an example dataset, and then moving to examples of dropping variables or using subsetting.Files associated with this presentation can be downloaded below.RScript file: drive.google.com/file/d/1ujZPp5XcY6GSTyew_41XG0vPSx52fPi4/viewText file: drive.google.com/file/d/1pp0IqBaQmEMwTV-r5ySCt7alVy2yPA18/viewBe sure to check out my online sites at:drmcstats.netsites.google.com/view/statistics-for-the-real-world/home
Importing Excel or Text file with missing data into R Studio (see links under video description) Mike Crowson 2023-02-25 | This video provides a general walkthrough of how to import data into R Studio and how to ensure that R Studio recognizes missing data should you choose to use a missing value code in your original dataset. The data files for this demonstration can be downloaded below:drive.google.com/file/d/1nEE7XOwJnl-Jz67NhfPzLQpcuy6rLTxq/viewdrive.google.com/file/d/1ENmblNKVOIpotWMkVB_BaXRIUnOJ8bOe/viewdrive.google.com/file/d/1k65qOZXZ0iyX98Z_iLfPDaJMNJhZ6CyC/view
Importing SPSS file with missing data into R Studio (see video description for linked data files) Mike Crowson 2023-02-25 | This video demonstrates how to import data into R Studio from SPSS, where the data has missing values on several variables. In discuss how R recognizes missingness with the value of NA, and then demonstrate ways to ensure that R Studio recognizes missingness when missing value codes are provided.Feel free to download the following datasets for practice:drive.google.com/file/d/1NSPstqH_xVOPtoDMAi6RTjtck2xjcjRk/viewdrive.google.com/file/d/1RNIDme0HNbwr-bGyBe8VQqlsjDmkEPLy/view drive.google.com/file/d/11fZhKgKuvZf3Pm4EoH_GqMQFIUeoQmxz/view?usp=share_link
One between, one within repeated measures ANOVA with SPSS 29 (see links under video description) Mike Crowson 2023-01-20 | In this video I provide a walk through of an example of repeated measures ANOVA involving a single between subjects factor and a single within subjects factor. I discuss both the multivariate and univariate test results, provide an overview of how to interpret the polynomial contrasts (useful only in those cases where levels of the repeated factor are ordered), and interpretation of simple effects tests and profile plots. You can download a copy of the data here:drive.google.com/file/d/1tOOI9slDstGCub05j6tJ_9-aIKoYaS8J/viewYou can download a supplemental powerpoint here: drive.google.com/file/d/1iSU4402r5bzKxd55cFHnsBhl-_KOGqBM/viewBe sure to check out my online sites at:drmcstats.netsites.google.com/view/statistics-for-the-real-world/home
Second order confirmatory factor analysis using lavaan in RStudio (see link under video description) Mike Crowson 2023-01-19 | In this video, I provide a walk-through of how to perform a test of a second-order factor analysis using the lavaan package in R Studio. I begin the video with a discussion of the difference between a first order factor model and a second order factor model. I proceed to demonstrate how to run the analyses using syntax in lavaan.A copy of the syntax file used in the video can be downloaded here:drive.google.com/file/d/1KeiOiAO2RqLk0pqDRT6kj0opmwlcU4T5/viewBe sure to check out my online sites at:drmcstats.netsites.google.com/view/statistics-for-the-real-world/home
Second order confirmatory factor analysis in Stata (Jan 2023; see links in video description) Mike Crowson 2023-01-19 | In this video, I provide a conceptual introduction to second-order CFA (comparing it to the first order CFA model); I move to testing both first and second order CFA models using Stata and then comparing them in terms of their fit. I demonstrate the use of the chi-square difference test and information criteria for judging relative fit between the models.A copy of the data can be downloaded here: drive.google.com/file/d/13Kk--wr1QdLsuZbSp5EJP8-ceHkUKRk7/viewFile containing path diagram for first-order factor model:drive.google.com/file/d/19bUssIWH3aHKe4NzND72gni5WIX2D-V7/viewFile containing path diagram for second-order factor model:drive.google.com/file/d/1ERWihMZnJR3eN6T2JGdBe7sdNha9cdnf/viewDo file used in demonstration of lrtest in video: drive.google.com/file/d/1pBDHrDSyIGENRAKCO0kKQtd71d03qt6_/viewA supplemental powerpoint can be downloaded here: drive.google.com/file/d/1ae-8LLB6g9-wX2NnAeTT342X481bVBCI/viewBe sure to check out my online sites at:drmcstats.netsites.google.com/view/statistics-for-the-real-world/home
Exploratory factor analysis with Stata (Jan 2023; see links under video description) Mike Crowson 2023-01-17 | In this video, I walk through steps involved in performing an exploratory factor analysis using Stata. I begin with a review of how to determine factorability of a correlation matrix; then I proceed to demonstration of strategies for determining the number of factors that may account for the interrelationships among your measured variables; following we force a solution with the number of factors identified in the previous step and interpret rotated loadings. Throughout the presentation, I demonstrate steps by writing syntax into a Do-File in the hopes that you consider this approach in the future, particularly when carrying out more complex analyses. Here is a link to information on a very useful book on EFA with Stata: stata.com/bookstore/step-by-step-guide-to-exploratory-factor-analysis-with-stataYou can download a copy of the data here:drive.google.com/file/d/1Ei527SO9T-OEBMc-KCSS1USThN0ZKu2o/viewYou can download a copy of the Do-file I wrote here: drive.google.com/file/d/1Y61kmSiUAJugdJM2l1mkd-swvOwHmLAs/viewYou can download a Powerpoint presentation (for more detail) here:drive.google.com/file/d/1iDnI8SbLPBpq6n0LeD-VWgRuUEnIQjt-/viewBe sure to check out my online sites at:drmcstats.netsites.google.com/view/statistics-for-the-real-world/home
Factorial ANOVA SPSS 29 (Jan 2023; see links in video description) Mike Crowson 2023-01-15 | This video provides a general walk-through of a two-way factorial ANOVA using SPSS. I begin by discussing concepts of statistical interaction and conceptualization of focal independent variable and moderator variable. I then perform the steps in SPSS for generating output. Following, I walk through the output providing interpretations of results in light of the conceptual framework provided earlier.Download a copy of the data here to follow along: drive.google.com/file/d/1c1zafdm8Rj33Vaov7ROixSkrdRnPQ8eC/viewYou can download a Powerpoint presentation here: drive.google.com/file/d/1QMJRYv7CjK65vyWWytasIf1ayh44xHeJ/viewBe sure to check out my online sites at:drmcstats.netsites.google.com/view/statistics-for-the-real-world/home
Cronbachs alpha and writing a program for bootstrap confidence interval in Stata (Jan 2023) Mike Crowson 2023-01-13 | This video discusses how to generate Cronbach's alpha in Stata using the drop-down menu and syntax. I also demonstrate how to write a program to generate a bootstrap confidence interval for alpha. Download a copy of the data file here: drive.google.com/file/d/1usVGwcAF-nl_dG4uILb55q-ZYjUAddhb/viewExample do-file: drive.google.com/file/d/1jaR0Ah9VR5l0-RvokPru2B5e4V1Lna8l/viewBe sure to check out my online sites at:drmcstats.netsites.google.com/view/statistics-for-the-real-world/home
Cross-lagged panel analysis with Stata (2023; see links to data, etc. under video description) Mike Crowson 2023-01-11 | In this video, I provide a demonstration of cross-lagged panel analysis using an example from Acock's (2013) text, Discovering Structural Equation Modeling Using Stata (see stata.com/bookstore/discovering-structural-equation-modeling-using-stata/).Download a copy of the data used here: drive.google.com/file/d/1I39MyG_rLWPjh_W1QgEcEn2KhDvcNcNO/viewYou can download a copy of the path diagram I draw in the video here: drive.google.com/file/d/1zSOjT-ETqEXRWuL2ly0NoaDn87aI9RO_/viewYou can download a copy of the Do-file I create here:drive.google.com/file/d/1cMn8LJ3nFtEM95zdklrOC2VoVrRaX4Hx/viewMore videos and resources on SEM with Stata can be found here:sites.google.com/view/statistics-for-the-real-world/contents/structural-equation-modelingBe sure to check out my online sites at:drmcstats.netsites.google.com/view/statistics-for-the-real-world/home
Testing full structural equation model using Lavaan (see linked text file under video description) Mike Crowson 2023-01-10 | This video demonstrates how to perform a path analysis using latent variables based on an example provided by Kline (2016) in his text, Principles and Practice of Structural Equation Modeling (4th ed). In this video, I begin by demonstrating how to create a full covariance matrix for a set of variables based on summary correlations and standard deviations provided by Kline (2016) in his example. Next, I demonstrate how to test a measurement model to assess how well the indicator variables are reflecting their latent constructs. Following, I test two full structural equation models, where proposed structural relations among the latent factors are specified. A copy of the TEXT FILE I referenced at the end the video can be downloaded here: drive.google.com/file/d/1_m-rV5d5ignBQf1ff8jT2yBkiMfxw8mV/viewNOTE: I have created a video as an amendment to the this presentation that can be viewed in a shorter video here: youtu.be/KHAIUARdA8Q . This video describes how to compute and test specific indirect effects within this model.More videos and resources on SEM with Lavaan can be found here:sites.google.com/view/statistics-for-the-real-world/contents/structural-equation-modelingBe sure to check out my online sites at:drmcstats.netsites.google.com/view/statistics-for-the-real-world/home
Confirmatory factor analysis using Stata (2023) Mike Crowson 2023-01-06 | In this video I analyze the Holzinger and Swineford (1939) data using Stata according to an example by Whittaker and Schumacker (2022). In this video, I demonstrate how to specify confirmatory factor analysis (CFA) models using the Stata SEM builder. I also provide interpretations as I go along with the demonstrations. A copy of the data can be downloaded here: drive.google.com/file/d/1SudMUhgV7Q5ADcBXcyKDp0prbPySf2qZ/viewA copy of the powerpoint referenced in the video can be downloaded here: drive.google.com/file/d/19v2nmhuM5G6OhclnilDEGFhVD6mEZtKJ/viewMore videos and resources on SEM with Stata can be found here:sites.google.com/view/statistics-for-the-real-world/contents/structural-equation-modelingBe sure to check out my online sites at:drmcstats.netsites.google.com/view/statistics-for-the-real-world/home
Getting started with SEM builder (GUI) in Stata: A multiple regression example (2023) Mike Crowson 2023-01-05 | This video is designed to provide you with a rudimentary understanding of how to use the Stata SEM builder to specify and test a structural equation modeling in Stata. We keep things pretty simple in this demonstration by using an example of multiple linear regression. A copy of the data can be downloaded here: drive.google.com/file/d/11Z84jgK90YQxtKifmC2nfPX7GLn6sha7/viewFor more information and resources on SEM with Stata, go here: sites.google.com/view/statistics-for-the-real-world/contents/structural-equation-modelingBe sure to check out my online sites at:drmcstats.netsites.google.com/view/statistics-for-the-real-world/home
Path analysis with manifest variables using Stata Part 2: Direct, indirect, and total effects Mike Crowson 2023-01-05 | This video builds on the discussion started in my previous video in this series (youtu.be/ZhsuNbC43w0). In this video, I provide a conceptual overview of direct, indirect, and total effects and demonstrate how to test specific and total indirect effects and total effects using various Stata commands. I discuss the nlcom command for carrying out these test. I also demonstrate how to set up a program for generating bootstrap standard errors and confidence intervals for carrying out these tests.A copy of the data file can be downloaded here: drive.google.com/file/d/1wuqjAc07WEdy5VONo8mGKIAQlTQDePiP/viewA copy of the file containing the path diagram created in my previous video (and used in this video) can be downloaded here: drive.google.com/file/d/1umBreb4vwCBOjQ1-pDrvdGMyj9Y3rhft/viewA copy of the Powerpoint referenced in the video can be downloaded here: https:////drive.google.com/file/d/1JV0j_3L-OR1EdQXsJgLkghIiZCY4f0XB/viewDo file containing code written in this video: drive.google.com/file/d/1iUK43Qal_4vqYlig6qIsmIJABiGw6q-C/view Link to website referenced in video: https://stats.oarc.ucla.edu/stata/faq/how-can-i-do-moderated-mediation-in-stata/
Path analysis with manifest variables using Stata Part 1: The basics Mike Crowson 2023-01-04 | This video provides a review of various path analysis concepts and introduces you to how to perform a basic path analysis using Stata. The example in this video is based on one that is provided by Whittaker and Schumacker (2022). The second video in this series can be found here: youtu.be/pI-zkXszFyQA copy of the data set referenced in the video can be downloaded here: drive.google.com/file/d/1wuqjAc07WEdy5VONo8mGKIAQlTQDePiP/viewA copy of the Powerpoint referenced in the video can be downloaded here: drive.google.com/file/d/1x0D6HQJ8mFJjJQqpnXZloVNxdW44F40v/view
Introductory overview of linear regression using Stata (Jan 2023) Mike Crowson 2023-01-04 | In this video, I provide a very general overview of linear regression using Stata. Included in the discussion is coverage of the drop-down menus for specifying a basic linear regression model, discussion of syntax, and overview of various portions of the output generated. Download a copy of the data here: drive.google.com/file/d/11Z84jgK90YQxtKifmC2nfPX7GLn6sha7/viewDownload a copy of the Powerpoint referenced in the video here: drive.google.com/file/d/1bpyrocBaD3Q7NnZoD14fhe4ZdS3GQ_j2/viewBe sure to check out my online sites at:drmcstats.netsites.google.com/view/statistics-for-the-real-world/home
Instats seminar: Regression and Moderation Analysis with SPSS and Process Mike Crowson 2022-10-05 | Please see the link to this seminar information at:instats.com/seminar/regression-and-moderation-analysis-with-9776For a structured course on SPSS and regression, see instats.com/structuredcourse/managing-and-analyzing-data-with-regression-and-process-in-spss3749
Using Hayes Process macro with R Studio to test a parallel mediation model (August 2022) Mike Crowson 2022-08-29 | In this video, I extend my discussion of how to perform mediation analysis using Hayes Process macro using R Studio - as begun in my previous video here: youtu.be/Id6zjPZoKvoSpecifically, I discussion how to test for parallel mediation using models that do and do not contain covariates using Hayes Process syntax. [Note: All discussion concerning how to find and download the Process macro and activate it is provided in my previous video: youtu.be/Id6zjPZoKvo ]An Excel file (.xls, 1997-2003) containing the data can be downloaded here: drive.google.com/file/d/1Adn0FP1E82v2moLupRAj8EZZ3O09CtaT/viewAn Excel file (.xlsx) containing the data can be downloaded here: drive.google.com/file/d/1a42FwMx3jn4RSAtuVgpbWdNAzqtPU7c4/viewA supplemental Powerpoint can be downloaded here: drive.google.com/file/d/1YG3zccr1lP7c73zghrohrHNYrwQUo_wi/view
Using Hayes Process macro with R Studio to test a simple mediation model (Aug 2022) Mike Crowson 2022-08-29 | In this video, I provide a demonstration how to use Andrew Hayes Process macro - found at processmacro.org/download.html - in R Studio to test a simple mediation model that includes or does not include covariates. I walk through a few basics of activating the macro in R Studio and importing data. Next, I specify mediation models using Hayes command structure. OBTAIN A COPY OF THE DATA HERE: drive.google.com/file/d/1xrpJx7RP0WV3Mbq9EWffSffoZcokydoo/viewSupplemental Powerpoint here: drive.google.com/file/d/1MyqjWDnnyc6EJGNvRw5QATmoUALG1n8z/viewFor a video on Parallel mediation using Process in R Studio, go here: youtu.be/D-ozA1va3GwFor a basic introduction to Multiple regression using R Studio, check out this video: youtu.be/1iRC_MbzOGQ
Multiple linear regression using R studio (Aug 2022) Mike Crowson 2022-08-26 | This video provides a general overview of linear regression using R Studio, covering a variety of functions that you might use to obtain output of interest. I cover some basic functions for screening data and examining correlations among variables, the lm() function for performing the linear regression, and various functions for different diagnostics one might be interested in obtaining. The video is not designed to be an exhaustive or comprehensive overview of regression and all aspects of decision-making with regression.A copy of the data (referenced in the video) can be downloaded here: drive.google.com/file/d/1d3P2vxI7X1aSpB5uhQyHSD2dJZjvg6M_You can also download a supplemental Powerpoint here:drive.google.com/file/d/1P_jhZsfECVs-dXIDXbU-ASgBIMJfWjmP
Introduction to R for SPSS users: Setting up and managing dataframes (and a few extras) Mike Crowson 2022-07-01 | This video is designed to give SPSS users who are interested in learning R and very basic introduction to how to set up and manage dataframes. Although I typically import data from other programs (rather than setting them up in the fashion shown here), I also felt that this would provide SPSS users with a better sense of how data can be structured in R. Additionally, the video is intended to provide a very general orientation to the object-oriented language of R. In this video, I use RStudio for the illustrations, but the commands I provide in this video work with the basic R interface.You can download a copy of the text file I reference near the end of the video here: drive.google.com/file/d/1c-_3ZXCVQzlYA994DGOAq4rFE9-L78S7/view
Multiple regression using dummy coding in Stata (June 2022) Mike Crowson 2022-06-16 | This video demonstrates various methods for testing the effect of a categorical independent variable on the dependent variable in a multiple regression analysis using Stata. I focus mainly on the use of dummy coding and various options for obtaining regression results using dummy coded variables. I also spend time showing viewers how results obtained using dummy coding compare to ANOVA and ANCOVA output (also generated using Stata). A copy of the dataset can be downloaded here: drive.google.com/file/d/1bSlzXNFVzW9myS_dNtjmJ-zNTB7CIO9wYou can obtain a copy of the Powerpoint referenced in the video here: drive.google.com/file/d/1Tqu-O8MyLR_Cd3SJ6aFPDS4DYuptKQTH
Determining number of factors during EFA using Maximum Likelihood factor analysis in SPSS Mike Crowson 2022-06-11 | In this video, I provide a demonstration of an approach (i.e., Maximum likelihood factor analysis) to aid you in making a decision regarding the number of factors that best account for the intercorrelations among your measured variables during factor analysis. In the video, I demonstrate a process of generating measures of model fit for one-, two-, three-, and four-factor models, including the chi-square goodness of fit test and the RMSEA (root mean square error of approximation).Some of the discussion points I raise are addressed in:Fabrigar, L. R., & Wegener, D. T. (2012). Exploratory factor analysis. Oxford University Press.Feel free to download a copy of the dataset here: drive.google.com/file/d/1xTOJl63NYRAljyUzKyQ0w1R8VNYgp1PxDuring the presentation, I use an Excel file to make certain calculations. You can download a copy of the final file here: drive.google.com/file/d/1QjFr7ogdeawvsatPBoDLoL1xVUo5ItLDIn the video, I reference another presentation on Parallel analysis as a basis for determination of factors. Here is the link: youtu.be/AKE49mHkoKo
Parallel analysis for PCA and EFA in SPSS using OConnors syntax Mike Crowson 2022-06-10 | This video provides a demonstration of how to use Brian O'Connor's syntax (found HERE: oconnor-psych.ok.ubc.ca/nfactors/nfactors.html) to perform parallel analysis using SPSS. In the video, I demonstrate how to perform parallel analysis in the context of Principal Components Analysis and in the context of Exploratory Factor Analysis (using Principal Axis factoring). Some of the discussion points I raise are addressed in:Fabrigar, L. R., & Wegener, D. T. (2012). Exploratory factor analysis. Oxford University Press.Link to O'Connor's page: oconnor-psych.ok.ubc.ca/nfactors/nfactors.htmlDownload a copy of the dataset: drive.google.com/file/d/1DS8xeyZCA4WAZFomJvjfzVxZmbVIteVf
Polynomial regression with covariates in SPSS: Identifying and describing a quadratic relationship Mike Crowson 2022-05-10 | In this video, I walk you through an approach for identifying and describing a quadratic functional relationship between a focal independent variable and the dependent variable in a linear regression that includes covariates. I discuss identification of non-linearity using residuals plots and an approach for graphing a quadratic functional relationship between the IV and DV while holding the covariates constant at their means. The example is based around a discussion in Chapter 12 of Darlington & Hayes (2017) book: afhayes.com/regression-analysis-and-linear-models.htmlDownload a copy of the data used in the video here: drive.google.com/file/d/11LIpryp2MbGMG0C8aszUnjPM43sLcbdHSupplemental powerpoint: drive.google.com/file/d/1cDTTe7VfuzZVwMt4tq5IIb__djBquF26
