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7
Tests for Multiple Related Samples
Some research studies require that three or more measures be taken over
time, under different conditions, or on different sets of individuals or subjects.
This chapter presents the Cochran Q test in Section 7.1 and the Friedman test
in Section 7.2. Kendall’s coefcient of concordance is included as part of both
sections and discussed further in Section 7.3. The Cochran Q and Friedman
tests analyze differences on repeated measures for a single case or for multi-
ple related samples. In a single case design, every participant is measured on
several occasions or under several different conditions. In a matched ...