[R] Extracting t values from object of class `"pairwise.htest"'

[Marc Schwartz]

> -----Original Message-----
> From: Peter Dalgaard BSA [mailto:p.dalgaard at biostat.ku.dk]
> 
> "Marc Schwartz" <mschwartz at medanalytics.com> writes:
> 
> > > -----Original Message-----
> > > Achim Zeileis writes:
> > >  > Sven Garbade wrote:
> > >  > >
> > >  > > Hi,
> > >  > >
> > >  > > can I extract the p-values after a pairwise comparision with
> > >  > > pairwise.t.test()? The object of class "pairwise.htest".
> > >  >
> > >  > This is a list with one component being "p.value". You can
extract
> > it as
> > >  > usual with
> > >  >   pairwise.t.test()$p.value
> > >
> > > Sorry, I don't mean the p-values, but the t-values.
> >
> > That would be:
> >
> > pairwise.t.test(...)$statistic
> >
> > Look at ?t.test and scroll to the "Value" section which defines the
list
> > components returned.
> 
> But pairwise.t.test doesn't return the individual t statistics. It
> ends with
> 
>     ans <- list(method = METHOD, data.name = DNAME, p.value = PVAL,
>         p.adjust.method = p.adjust.method)
>     class(ans) <- "pairwise.htest"
>     ans
> 
> so you'd have to modify the function to get at the actual t
statistics.

Thanks Peter.  I stand corrected.  I missed the now obvious and not so
subtle difference in the class objects of htest and pairwise.htest.

Marc



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