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Dear all, I am trying to calculate sample size for a clinical research, on the basis of generalized wilcoxon test or Tarone-Ware test. It seems SAS can do this job using it "POWER" procedure, but SAS is not available to me. I would be very grateful if you could let me know if any R package or other tools which could cope with this problem. Best Regards, Wang [[alternative HTML version deleted]]

...10,] 4.5801216 6.887120 4.554956 11.1188844 [[1]]$phi [1] 5.395758 [[1]]$mu [1] -0.151400686 0.459786917 -0.091988847 -0.009952914 0.074523419 [6] 0.215198198 -0.010968581 -0.026347501 0.423837846 -0.018999184 [[1]]$rho [1] 147 Any help you can give me is greatly appreciated. Aaron Tarone ______________________________________ Aaron Tarone Postdoctoral Research Associate Molecular and Computational Biology Program University of Southern California atarone at usc.edu (213) 740-3063

Just a general question concerning the woolf test (package vcd), when we have stratified data (2x2 tables) and when the p.value of the woolf-test is below 0.05 then we assume that there is a heterogeneity and a common odds ratio cannot be computed? Does this mean that we have to try to add more stratification variables (stratify more) to make the woolf-test p.value insignificant? Also in the