[R] testing independence of categorical variables

[Bernardo Rangel Tura]

On Thu, 2007-11-22 at 16:16 +0500, Shoaaib Mehmood wrote:
> hi,
> 
> is there a way of calculating of measuring dependence between two
> categorical variables. i tried using the chi square test to test for
> independence but i got error saying that the lengths of the two
> vectors don't match. Suppose X and Y are two factors. X has 5 levels
> and Y has 7 levels. This is what i tried doing
> 
> >temp<-chisq.test(x,y)
> 
> but got error "the lengths of the two vectors don't match". any help
> will be appreciated


Hi Shoaaib,

Try using chisq.test(table(x,y)).

If you using chisq.test(x,y) R will testing goodness-of-fit.


-- 
Bernardo Rangel Tura, M.D,Ph.D
National Institute of Cardiology
Brazil