[R] how to extract object from stats test output (cor.test)?

[Duncan Murdoch]

On 6/19/2008 11:01 AM, Patrick Ayscue wrote:
> Hello,
> 
> Is there a way to extract output objects from a stats test without viewing
> the entire output?  I am trying to do so in the following:
> 
> define a vector of length j
> 
> for( i in 1: length (vector)) {
> vector[i] = cor.test (datavector1, datavector2[i], method=("spearman"))
> }
> 
> I would like the reported Spearman's rho to be saved in a vector.  I have
> tried a few different ways of doing this but seem unable to figure out how
> to get only that output without looking at each report and copying by hand.

See the Value section of the ?cor.test man page.  It says that the 
result is a list containing (among other things) the components

statistic: the value of the test statistic.

estimate: the estimated measure of association, with name '"cor"',
           '"tau"', or '"rho"' corresponding to the method employed.

I think "estimate" is what you want, which you can get as

cor.test (datavector1, datavector2[i], method=("spearman"))$estimate

This is a numeric vector with one element named "rho", in the example on 
the ?cor.test page.

Duncan Murdoch

> 
> 
> Any help would be appreciated.
> 
> 
> Thanks,
> Patrick
> 
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