Non-parametric tests for dependent samples

Abstract

The choice of tests for dependent samples, as with tests for independent samples, is affected by the level at which the test variable is measured. For interval/ratio data, in Chapter 17, we used a t-test for the mean difference. This chapter will consider non-parametric tests that can be applied to dependent samples compared in terms of nominal or ordinal data:

• The McNemar test/Sign test These are used when the test variable is arranged into a binomial distribution (often after collapsing values).

• The Wilcoxon signed-ranks test This is used when the test variable is measured at least at the ordinal level.