Comparing k Dependent Samples

Friedman’s test enables you to compare the locations of three or more dependent samples. You can obtain Friedman’s chi-square with the FREQ procedure by using the CMH2 option and SCORES=RANK and by looking at the second CMH statistic in the output. For an example, see Chapter 36, The FREQ Procedure. This chapter also contains formulas and other details about the CMH statistics. For a discussion of how to use the RANK and GLM procedures to obtain Friedman’s test, see Ipe (1987).