On Jan 30, 2010, at 8:24 PM, Mathew, Abraham T wrote:
I'm an R newbie and had the following question. I'm trying to run a
logit model because I have a dependant variable that is a factor
with three levels. Each of my independent variables are factor
variables and have two or more levels, which is why I'm unsure about
the error.
How are you expecting glm to construct a _binomial_ model with a
dependent variable that has 3 levels?
regone <- glm(data96$RV961327 ~ data96$RV960605 + data96$RV960610 +
data96$RV960337 + data96$RV960385 + data96$RV960417 +
data96$RV960615 + data96$RV960698 + data96 $RV960714 +
data96$RV961145 + data96$RV960067 + data96$RV960702,
family=binomial(logit))
Perhaps:
library(MASS)
?polr
(Or)
library(nnet)
?multinom
(Or)
library(rms)
?lrm
This produces the following error.
Error in `contrasts<-`(`*tmp*`, value = "contr.treatment") :
contrasts can be applied only to factors with 2 or more levels
--
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
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