Re: [R] sample size of 2 groups of skewed data

From: Kjetil Halvorsen <kjetilbrinchmannhalvorsen_at_gmail.com>
Date: Tue, 15 Mar 2011 11:26:37 -0400

did you try to fit your data with a skew-normal/skew-t distribution? If that works, you can use simulation.

Kjetil

On Tue, Mar 15, 2011 at 2:31 AM, Lao Meng <laomeng.3_at_gmail.com> wrote:
> 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]]
>
>
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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 - 15:29:54 GMT

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