[R] Newbie syntax question

From: Joe Trubisz <jtrubisz_at_mac.com>
Date: Sat, 12 Jan 2008 21:06:08 -0500


Hi...

I'm trying to understand the following syntax:

cor.test(~mortality + hardness,data=water,method="pearson")

which is the same as:

cor.test(water$mortality,water$hardness,data=water,method="pearson")

Can anyone point me to the correct doc or explain to me how to interpret "~mortality + hardness"?

Thanks,
Joe



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