R help - Apr 2007 - 2 samples KS-test...

Dear R-users,

I have some trouble to perform a 2-samples KS test.
Apparently my 2 samples are numerical (see below) but R
complains that the "y" term is not....

-------------------------------------------------------------------------------------
 > str(subset(mydata,Identified=="NO",select=KD))
'data.frame':   2889 obs. of  1 variable:
 $ KD: num  -0.272 -0.080 -0.311 -0.222 -0.346 ...
 > str(subset(mydata,Identified=="YES",select=KD))
'data.frame':   443 obs. of  1 variable:
 $ KD: num  -0.0772 -0.6635 -0.1283 -0.0748 -0.3036 ...
 > 
ks.test(x=subset(mydata,Identified=="NO",select=KD),y=subset(mydata,Identified=="YES",select=KD))
Erreur dans ks.test(x = subset(mydata, Identified == "NO", select =
KD),  :
        'y' doit ?tre num?rique ou bien une cha?ne de caract?res donnant
le nom de la fonction ad?quate
-----------------------------------------------------------------------------------------

Thanks for any hint,

St?phane.

Conf: R-2.4.1 on win XP sp2.

-- 
"La science a certes quelques magnifiques r?ussites ? son actif mais
? tout prendre, je pr?f?re de loin ?tre heureux plut?t qu'avoir
raison."
D. Adams
-- 
AGC website <http://www.genoscope.cns.fr/agc>
	St?phane CRUVEILLER Ph. D.
Genoscope - Centre National de S?quencage
Atelier de G?nomique Comparative
2, Rue Gaston Cremieux CP 5706
91057 Evry Cedex - France
Phone: +33 (0)1 60 87 84 58
Fax: +33 (0)1 60 87 25 14
scruveil at genoscope.cns.fr

On Mon, 16 Apr 2007, St?phane CRUVEILLER wrote:
> Dear R-users,
>
> I have some trouble to perform a 2-samples KS test.
> Apparently my 2 samples are numerical (see below) but R
That says there are data frames, not numeric vectors. That would be easier 
to see if you printed the value (rather than use str(), which is often 
helpful but not so here to you at least).

You want

x = subset(mydata,Identified=="NO")$KD

etc, I think.
> complains that the "y" term is not....
>
>
-------------------------------------------------------------------------------------
> > str(subset(mydata,Identified=="NO",select=KD))
> 'data.frame':   2889 obs. of  1 variable:
> $ KD: num  -0.272 -0.080 -0.311 -0.222 -0.346 ...
> > str(subset(mydata,Identified=="YES",select=KD))
> 'data.frame':   443 obs. of  1 variable:
> $ KD: num  -0.0772 -0.6635 -0.1283 -0.0748 -0.3036 ...
> >
>
ks.test(x=subset(mydata,Identified=="NO",select=KD),y=subset(mydata,Identified=="YES",select=KD))
> Erreur dans ks.test(x = subset(mydata, Identified == "NO", select
= KD),  :
>        'y' doit ?tre num?rique ou bien une cha?ne de caract?res
donnant
> le nom de la fonction ad?quate
>
-----------------------------------------------------------------------------------------
>
> Thanks for any hint,
>
> St?phane.
>
> Conf: R-2.4.1 on win XP sp2.
>
>
-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
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