[Rd] formula(CO2)

From: Gabor Grothendieck <ggrothendieck_at_gmail.com>
Date: Mon, 16 Jul 2007 09:28:50 -0400

The formula attribute of the builtin CO2 dataset seems a bit strange:

> formula(CO2)

Plant ~ Type + Treatment + conc + uptake

What is one supposed to do with that? Certainly its not suitable for input to lm and none of the examples in ?CO2 use the above.

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