[R] Getting betas in lm
Prof Brian D Ripley
ripley at stats.ox.ac.uk
Thu Apr 27 10:36:33 CEST 2000
On Thu, 27 Apr 2000, Ragnar Beer wrote:
> is there a simple way to get beta weights from lm? So far I've done
> z-transformations of the variables before using them in lm.
Could you please explain your notation? coef(fit) gives the coefficients,
which may be what you want.
> I also wonder whether there is a function to calculate variance with
> n instead of (n-1)?
cov.wt does so in S-PLUS but not R. It is very easy to write one (if
you really want one):
myvar <- function(x, y) var(x)*(1 - 1/NROW(x))
I think does what you want, at least if there are no missing values.
Brian D. Ripley, ripley at stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272860 (secr)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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