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I have 13 subjects all who completed 3 different warm-up protocols. I want to compare the results of their countermovement jump height test results after each warm-up. My data is not normally distributed. Is there a difference between conducting a Friedman test and post hoc test to see where the difference lies or conducting threeWilcoxon Signed Rank tests between each warm-up to see where the differences lie ?

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    $\begingroup$ Yes there is a difference. Friedman test is not the direct extension of the Wilcoxon test (in a manner like ANOVA is the extension of t-test or Kruskal -Wallis is the extension of Mann-Whitney). Friedman test has its own post-hoc pairwise comparison procedure invented. $\endgroup$
    – ttnphns
    Commented May 12, 2015 at 13:55
  • $\begingroup$ I think the sign test is the paired test that corresponds to the Friedman. $\endgroup$
    – Glen_b
    Commented May 12, 2015 at 23:29

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