step-down analysis

  1. G

    Stepweise step down post hoc test for Kruskal-wallis in SPSS

    Hello, What are the criteria for computing the pairwise or the stepwise step-down comparison in SPSS after Kruskal-Wallis? I know that the pairwise comparison is more conservative than the stepwise comparison, but are there any other criteria to decide which post-hoc test to use? Does anybody...
  2. C

    MANCOVA and step-down analysis

    I have a question concerning the use of step-down analysis after MANCOVA. While I understand the steps for MANOVA, when I started using a covariate (MANCOVA) I became confused. Do you still do step-down analysis after a significant MANCOVA test? If so, do you use the covariate as part of that...