[R] (no subject)

[Gavin Simpson]

On Wed, 2005-11-02 at 13:10 +0100, Illyes Eszter wrote:
> Dear Colleagues,
> 
> It is Eszter IllyÃ©s 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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Gavin Simpson                     [T] +44 (0)20 7679 5522
ENSIS Research Fellow             [F] +44 (0)20 7679 7565
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