[R] Using 'sapply' and 'by' in one function

[hadley wickham]

On Feb 10, 2008 8:25 AM, Gabor Grothendieck <ggrothendieck at gmail.com> wrote:
> Actually thinking about this, not only do you not need sapply but you
> don't even need by:
>
> new2 <- transform(new, sex = factor(sex))
> coef(lm(as.matrix(new2[1:2]) ~ sex/Pred - 1, new2))

Although that's a very slightly different model, as it assumes that
both sexes have the same error variance.

Hadley


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