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Hi， I saw such a sentence"The -F 3 option does cluster-based multiple-comparison-correction (with an arbitrary threshold of 3, which is only an example here) but could be substituted with any other valid multiple-comparison-correction option such as --T2, -x, -S." .And then how to choose the options among -F ,--T2,-x ,-S ? Maybe try them respectively . Please provide some ideas . Thank you in advance . Xin-Fa Shi . 2014-07-09 17:30 GMT+08:00 Anderson M. Winkler <[log in to unmask]>: > Hi, > There's no strict rule for this, but the best is that the value isn't too > low. Say your F-test has df1=2 and df2=100. An F-statistic that produces > p=0.001 is 7.4, and this could be used. But the 0.001 is arbitrary, and > could as well have been another value. It could indeed be 3 (that gives > p~0.05 with similar df). > All the best, > Anderson > >