[R] summary(glm) for categorical variables
Eleni Rapsomaniki
e.rapsomaniki at mail.cryst.bbk.ac.uk
Mon Sep 11 16:40:12 CEST 2006
Dear list people
Suppose we have a data.frame where variables are categorical and the response is
categorical eg:
my.df=NULL
for(i in LETTERS[1:3]){my.df[[i]]=sample(letters, size=10)}
my.df=data.frame(my.df)
my.df$class=factor(rep(c("pos", "neg"), times=5))
my.glm=glm(class ~ ., data=my.df, family=binomial)
summary(my.glm)
....
Estimate Std. Error z value Pr(>|z|)
(Intercept) 2.457e+01 1.310e+05 1.88e-04 1
Ad -8.559e-11 1.853e+05 -4.62e-16 1
Aj -9.897e-10 1.853e+05 -5.34e-15 1
An -4.913e+01 1.853e+05 -2.65e-04 1
...
My question is is it possible to get the terms to appear as A,B, C instead of
every combination of Aa, Ab, Ac etc separately?
Many Thanks in advance
Eleni Rapsomaniki
Birkbeck College, UK
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