Hypothesis Tests in Stata

Many statistical tests require one or more variables to be normally distributed in order for the results of the test to be…

Levene’s Test is used to determine whether two or more groups have equal variances. This is a widely used test in statistics because…

The Wilcoxon Signed Rank Test is the non-parametric version of the paired t-test. It is used to test whether or not there is a…

The most common way to compare the means between two independent groups is to use a two-sample t-test. However, this test assumes…

A Mann-Whitney U test (sometimes called the Wilcoxon rank-sum test) is used to compare the differences between two samples when the sample distributions are…

A two sample t-test is used to test whether or not the means of two populations are equal. This tutorial explains how to conduct…

A one sample t-test is used to test whether or not the mean of a population is equal to some value. This tutorial explains…