Uploaded May 2023 | Updated September 2026, 1 hour ago
Kendall's tau is a correlation coefficient and is therefore a measure of the relationship between two variables.
But what is the difference between the Pearson correlation and the Spearman rank correlation? In contrast to the Pearson correlation, the Kendall's rank correlation is a non-parametric test procedure. For the calculation of Kendall's Tau, the data does not have to be normally distributed and the two variables only have to have an ordinal scale level. Kendall's Tau is very similar to Spearman's rank correlation coefficient. However, Kendall's Tau should be preferred over Spearman's correlation when there is very little data with many rank ties!
► Online calculator Kendall's Tau
numiqo.com/statistics-calculator/correlation
► Tutorial Kendall's Tau
numiqo.com/tutorial/kendalls-tau
► EBOOK
numiqo.com/statistics-book
Kendall's tau is a correlation coefficient and is therefore a measure of the relationship between two variables.
But what is the difference between the Pearson correlation and the Spearman rank correlation? In contrast to the Pearson correlation, the Kendall's rank correlation is a non-parametric test procedure. For the calculation of Kendall's Tau, the data does not have to be normally distributed and the two variables only have to have an ordinal scale level. Kendall's Tau is very similar to Spearman's rank correlation coefficient. However, Kendall's Tau should be preferred over Spearman's correlation when there is very little data with many rank ties!
► Online calculator Kendall's Tau
numiqo.com/statistics-calculator/correlation
► Tutorial Kendall's Tau
numiqo.com/tutorial/kendalls-tau
► EBOOK
numiqo.com/statistics-book



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![Violin Plot [Simply explained]
A violin plot is a method of plotting numeric data and can be understood as a combination of a box plot and a kernel density plot. It provides a visualization of data distribution.
But how do we interpret a violin plot?
Kernel Density Estimation:
This is the outer layer of the violin plot and displays the density of the data at different values. The width of the plot at different values indicates the density of the data: a wider section suggests a higher density (more data points), whereas a narrower section indicates lower density (fewer data points). The violin plot is typically symmetrical, meaning it mirrors the density estimation on either side of its axis.
Central Box Plot which is Optional:
Inside the violin, there is often a miniature box plot which provides additional details about the datas distribution. The central line in this box plot represents the median of the data, while the edges of the box represent the interquartile range, giving insights into the datas spread.
Whiskers which are Optional:
Like in a box plot, whiskers might extend from the box, indicating variability outside the upper and lower quartiles. They can provide a visual cue for identifying outliers.
► Make a Violin Plot online
https://numiqo.com/statistics-calculator/charts/violin-plot
► E-BOOK
https://numiqo.com/statistics-book Violin Plot [Simply explained]](https://i.ytimg.com/vi/Rw00VmP--qk/mqdefault.jpg)

