# Converting Kendall’s τ to r for meta-analysis?

Contents

## How do you interpret Kendall’s tau in R?

Kendall’s tau range between -1 to 1. If n is large Kendall’s τ equal to the 2/3 rd of Spearman’s rank correlation. If τ=1 indicates the ranking of X is in the same order as the ranking of Y. If τ=-1 indicates the ranking of X is in reverse order of the ranking of Y.

## Should I use Kendall’s tau or Spearman’s rho?

Spearman’s Rank Correlation

It is a non-parametric test that measures a monotonic relationship using ranked data. While it can often be used interchangeably with Kendall’s, Kendall’s is more robust and generally the preferred method of the two.

## Is Kendall’s tau a correlation test?

There are two accepted measures of non-parametric rank correlations: Kendall’s tau and Spearman’s (rho) rank correlation coefficient. Correlation analyses measure the strength of the relationship between two variables.

## What is the difference between Kendall and Pearson correlation?

we can see pearson and spearman are roughly the same, but kendall is very much different. That’s because Kendall is a test of strength of dependece (i.e. one could be written as a linear function of the other), whereas Pearson and Spearman are nearly equivalent in the way they correlate normally distributed data.

## What is cor in r?

cor: Correlation, Variance and Covariance (Matrices)

## What is the null hypothesis for Kendall Tau?

As before, the function cor shows that the Kendall correlation coefficient between Exer and Smoke is 0.083547. In order to decide whether the variables are uncorrelated, we test the null hypothesis that τB = 0.

## When should you use Kendall Tau?

When to use Kendall’s Tau

• You want to know the relationship between two variables.
• Your variables of interest are continuous with outliers or ordinal.
• You have only two variables.

## How does Kendall’s tau calculate ties?

Now C(n, 2) = C(15, 2) = 105 (cell M5), D = 72 (cell F19) and T = nx + ny – nx&y = 7 + 4 – 1 = 10. The number of ties is equal to the number of ties in x plus the number of ties y minus the number of ties for both x and y, nx&y.