Question

What are the elements and assumptions of the Wilcoxon Signed Rank Test?

Answer 1

The wilcoxon signed rank test is a non parametric statistical hypothesis test used to compare two related samples, matched samples,or repeated measurements on a single sample to assess whether their population mean ranks differ(I.e it is a paired difference test)

Assumptions-

1.dependent sample-the two samples need to be dependent observations of cases...

2.independence-The wilcoxon test assumes independence meaning that the paired observations are randomly and independently drawn..

3.continuous dependent variable-it assumes measurements are continuous in theoretical nature..to account for the fact that in most cases the dependent variable is binomial distributed,a continuity correction is applied

4.ordinal level of measurement-The wilcoxon sign test needs both dependent measurements to be at least of ordinal scale