Example 7.16: assess robustness of permutation test to violations of exchangeability assumption

October 24, 2009
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(This article was first published on SAS and R, and kindly contributed to R-bloggers)

Permutation tests (section 2.4.3) are a form of resampling based inference that can be used to compare two groups. A simple univariate two-group permutation test requires that the group labels for the observations are exchangeable under the null hypothesis of equal distributions, but allows relaxation of specific distributional assumptions required by parametric procedures such as the t-test (

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