Friday, February 17, 2006

st: non-parametric tests

Dear all, we ran an experiment where we asked people how many tasks they wanted to carry out under two different contracts. We ran both the Wilcoxon and the Sign tests on that data. I think that both tests check whether people prefer working more under one of the two contracts. Probably, the Wilcoxon test takes the magnitude of the difference into account, while the sign test does not. Am I right? If so, what does it mean if the difference between people=92s effort in contract A and in contract B is significant when I run the Wilcoxon test but not when I consider the Sign test? In my mind, the opposite would be more plausible=85What=92s the matter with my conclusions? Thank you very much for your help stefania

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