A SAS macro for a clustered permutation test.
Stedman MR, Gagnon DR, Lew RA, Solomon DH, Losina E, Alan Brookhart M.
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Comput Methods Programs Biomed. 2009 Jul;95(1):89-94. doi: 10.1016/j.cmpb.2009.02.005. Epub 2009 Mar 24.
Comput Methods Programs Biomed. 2009.
PMID: 19321221
Free PMC article.