[R] newbie question: p.values in a column

[Roger Peng]

I assume v is a matrix (not a vector)?  If so, try

new.v <- cbind(v, apply(v, 1, function(x) t.test(x)$p.value))

This should produce a 2000 x 7 matrix with the p-values in the 7th column.

-roger
_______________________________
UCLA Department of Statistics
rpeng at stat.ucla.edu
http://www.stat.ucla.edu/~rpeng

On Wed, 18 Sep 2002, Hao Chen wrote:

> Hello,
> 
> I have a vector (v) with 6 columns and 2000 rows. I am trying to do one 
> sample t.test for each row (I know this sounds crazy) and put the 
> p.values into the 7th column.
> 
> I know I can access the p.value via t.test(v[i,])[3]$p.value; I know I 
> can do t.test on the row by apply(v, 1, t.test), but I just couldn't 
> figure out how to fit them together.
> 
> I'd very appreciate your help!!
> 
> Hao Chen
> 
> 
> 
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