[R] How do I obtain the design matrix of an lm()?
Ajay Shah
ajayshah at mayin.org
Tue Oct 9 16:34:10 CEST 2007
I am using the clever formula notation of R to first do an OLS. E.g. I
say
m <- lm(y ~ x + f)
where f is a factor, and R automatically constructs the dummy
variables. Very nice.
I need to then go on to do some other ML estimation using the same
design matrix that's used for the OLS. I could, of course, do this
manually. But it seems that lm() has done all this hard work. I wonder
if there's a way to ask him nicely so as to get it. :-)
--
Ajay Shah http://www.mayin.org/ajayshah
ajayshah at mayin.org http://ajayshahblog.blogspot.com
<*(:-? - wizard who doesn't know the answer.
More information about the R-help
mailing list