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

[hadley wickham]

> > Although that's a very slightly different model, as it assumes that
> > both sexes have the same error variance.
> >
>
> But the output are the coefficients and they are identical.

For the sake of an example I'm sure that David simply omitted the part
of his analysis where he looked at the standard errors as well ;)

Hadley

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