Re: [R] (no subject)

From: Gavin Simpson <gavin.simpson_at_ucl.ac.uk>
Date: Wed 02 Nov 2005 - 23:27:12 EST

On Wed, 2005-11-02 at 13:10 +0100, Illyes Eszter wrote:
> Dear Colleagues,
>
> It is Eszter Illyés from Hungary. I just have started to use R yesterday,
> so I am a real beginner (but I could run some PCOA and managed to
> transpose a dataframe).
>
> No I have a problem that I would like to standardize my datafile with
> the row totals and than make an arcsin squareroot transformation.
> How can I do that? In which package shall I look for and for what
> option?

For standardising by row total look at decostand() with method = "total" in package vegan.

(360 / (2 * pi)) * asin(sqrt(x)) where x is vector of data-points will apply that transformation. If you want to apply it to all columns in your dataframe then look at ?sapply and modify the above accordingly.

HTH G

> Thank you very much, have a nice day
>
> Eszter
>
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R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Wed Nov 02 23:33:46 2005