[R] sample size of 2 groups of skewed data

From: Lao Meng <laomeng.3_at_gmail.com>
Date: Tue, 15 Mar 2011 14:31:30 +0800

Hi all:
I have a question on sample size calculation of 2 groups of data. If 2 groups of data are all normal distribution, then I can use the function "n.indep.t.test.eq" from samplesize package.But if 2 groups of data are all skewed distribution, but not normal distribution,how can I calculate the sample size then?
I've tried many transformation (e.g. log arcsin…) in order to transfer the skewed distribution data into normal distribution data, but failed. So what I can do is only find a calculation method to do with skewed data.

Any suggestions from you are welcome.
Thanks a lot for your help.

My best.

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