[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.

        [[alternative HTML version deleted]]



R-help_at_r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. Received on Tue 15 Mar 2011 - 06:41:37 GMT

Archive maintained by Robert King, hosted by the discipline of statistics at the University of Newcastle, Australia.
Archive generated by hypermail 2.2.0, at Tue 15 Mar 2011 - 15:40:21 GMT.

Mailing list information is available at https://stat.ethz.ch/mailman/listinfo/r-help. Please read the posting guide before posting to the list.

list of date sections of archive