[R] Subset results of tapply

[Richard.Cotton at hsl.gov.uk]

> I would like to extract only p.value by performing wilcox.test with 
> tapply function.

>  > tapply(tmp$pc, tmp$name, wilcox.test)
> 
> How can I extract only p.values of above command?

Try this:

wilcoxp <- function(x, ...)
{
    y <- wilcox.test(x, ...)
    y$p.value
}
tapply(tmp$pc, tmp$name, wilcoxp)

Regards,
Richie.

Mathematical Sciences Unit
HSL


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