[R] Help understanding lrm function of Design library
mark_difford at yahoo.co.uk
Tue Aug 18 14:26:39 CEST 2009
>> Could someone point me to an online resource where I could learn
>> more? (I'm big on trying to teach myself.) [about lrm funcction and the
>> Design library]
Go for the hardcopy, but you could look at Google Books if you are pressed.
There you will find a good preview of the text. Also look at Alzolla and
Harrell's excellent "An Introduction to S and the Hmisc and Design
Libraries" PDF, which you will find on CRAN under "Contributed
Noah Silverman-3 wrote:
> I'm developing an experiment with logistic regression.
> I've come across the lrm function in the Design library.
> While I understand and can use the basic functionality, there are a ton
> of options that go beyond my knowledge.
> I've carefully read the help page for lrm, but don't understand many of
> the arguments and optional return values.
> (penalty, penalty.matrix, strata.penalty, var.penalty, weights)
> Additionally, there are several items returned in the model that I don't
> (Max Derriv, Model L.R, C, Dxy, Gamma, Tau-a, R2, Briar, Wald Z)
> 1) Could someone point me to an online resource where I could learn
> more? (I'm big on trying to teach myself.)
> 2) Or, alternately, does anybody want to explain a few things for me?
> R-help at r-project.org mailing list
> PLEASE do read the posting guide
> and provide commented, minimal, self-contained, reproducible code.
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