You could also use a Wilcoxon signed-rank test to understand whether there was a difference in reaction times under two different lighting conditions (i.e., your dependent variable would be "reaction time", measured in milliseconds, and your two related groups would be reaction times in a room using "blue light" versus "red light"). This can occur when we wish to investigate any change in scores from one time point to another, or when individuals are subjected to more than one condition.įor example, you could use a Wilcoxon signed-rank test to understand whether there was a difference in smokers' daily cigarette consumption before and after a 6 week hypnotherapy programme (i.e., your dependent variable would be "daily cigarette consumption", and your two related groups would be the cigarette consumption values "before" and "after" the hypnotherapy programme). It is used to compare two sets of scores that come from the same participants. As the Wilcoxon signed-rank test does not assume normality in the data, it can be used when this assumption has been violated and the use of the dependent t-test is inappropriate. The Wilcoxon signed-rank test is the nonparametric test equivalent to the dependent t-test. Wilcoxon Signed-Rank Test using SPSS Statistics Introduction
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