If you have … In statistics, the Šidák correction, or Dunn–Šidák correction, is a method used to counteract the problem of multiple comparisons. This makes sense when you are comparing selected pairs of means, with the selection based on... •Following two-way ANOVA. Prism can perform Bonferroni and Sidak multiple comparisons tests as part of several analyses: •Following one-way ANOVA. In order to be protected from it, one strategy is to cor-rect the alpha level when performing multiple tests… Thisproblem is called the inﬂation of the alpha level. This makes sense when you are comparing selected pairs of means, with the selection based on... •Following two-way ANOVA. Scheff 's method may be more powerful than the Bonferroni or Sidak methods if the number of comparisons is large relative to the number of means. number of tests, the easier it is to ﬁnd rare events and therefore the easier it is to make the mistake of thinking that there is an ef-fect when there is none. When all null hypotheses are true, the method provides familywise error control that is exact for tests that are stochastically independent, is conservative for tests that are positively dependent, and is liberal for tests that are negatively dependent. It is a simple method to control the familywise error rate. It is credited to a 1967 paper by the statistician and probabilist Zbyněk Šidák Most other multiple comparison methods can find significant contrasts when the overall F-test is nonsignificant and, therefore, suffer a loss of power when used with a preliminary F-test. Prism can perform the Holm multiple comparisons test as part of several analyses: •Following one-way ANOVA.

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