>>r <- glm(brain.cancer~epilepsy+other.cancer-1, c3, >> family=binomial(link="logit") )
The construct "-1" on the right hand side of a formula means to exclude the intercept. See, e.g., "model formulae" in the index to Modern Applied Statistics with S by Venables & Ripley. I don't remember doing this with glm, but I've done it with lm.
hope this helps. spencer graves
Ross Boylan wrote:
I want to do a logistic regression without an intercept term. This option is absent from glm, though present in some of the inner functions glm uses. I gather glm is the standard way to do logistic regression in R.
Hoping it would be passed in, I said
r <- glm(brain.cancer~epilepsy+other.cancer, c3, family=binomial(link="logit"), intercept=FALSE)
which produced Error in glm.control(...) : unused argument(s) (intercept ...)
Is there an easy way to do this? I suppose I could start hacking away at glm so it would take the argument and pass it on, but is it absent for a reason?
Also, I noticed that S-Plus but not R has a glim routine that uses maximum likelihood. What would be the equivalent?
Thanks.
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