The development of this E-Book has been
supported by the British Academy.
Wilcoxon Sign Rank Test practical questions
In this practical we are going to investigate how to perform a Wilcoxon test using SPSS. A Wilcoxon test is used when we have two interval or ratio level variables measured for a set of observations and we want to test if the distribution is different for the two variables but we are unable to assume normality for one or both of the variables. It can also be to compare ordered categorical variables. It is the non-parametric equivalent of the paired t-test but unlike the t-test it tests differences in the median rather than the mean. The test does not assume any distribution for the two variables. To run a single test in SPSS requires that your dataset has two column containing the two variables to be compared.
The development of this E-Book has been
supported by the British Academy.