Re: [R] Using "subset" in correlation analysis

From: Mark Lyman <mark.lyman_at_gmail.com>
Date: Wed, 19 Mar 2008 14:08:16 +0000 (UTC)

James J. Roper <jjroper <at> gmail.com> writes:

>
> The correlation test function says that it can do a subset where one
> specifies the subsete vector. I cannot seem to get it to work.
>
> For example, the command line is:
>
> cor.test(adults$Alt, adults$Cab, alternative="greater", method="pearson")
>
> So, let´s say my subset vector is "Sex". How would I state the command
> to get the test of that subset?
>
> Thanks in advance.
>
> Jim

The subset argument only applies to the formula method. It should be a boolean vector something like the following (assuming adults is a data frame):

cor.test(~ Alt + Cab, adults, Sex=="MALE", alternative="greater", method="pearson")



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