[R] Logistic regression in R?
plummer at iarc.fr
Mon Mar 25 16:15:20 CET 2002
On 25-Mar-2002 Peter Dalgaard BSA wrote:
> Fredrik Karlsson <fredrik.karlsson at ling.umu.se> writes:
>> Hi all!
>> I want to do some logistic regression. Is there a fintion in R that does
>> this, or do I have to do the variable conversion by hand?
>> Thankful for all the help I can get.
> glm(...., family=binomial) should do it (unless you mean something
> different than the usual by "logistic regression")
glm() gives results in terms of log odds ratios. Most epidemiologists
that I know prefer to think in terms of odds ratios, and it would be
quite helpful to have a summary function that reports estimates and
confidence intervals for the transformed parameters. I don't know if
that is what Fredrik means by "variable conversion", but it reminded me of
this problem. I suggest a "transform=FUN" argument for summary.glm.
Incidentally, stata and SAS both have separate procedures for logistic
regression and glms, perhaps for this reason, in addition to historical
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