Dear R users,
I'm trying to save the results of separate logistic regression analyses of a
dataset according to a categorical factor. For that, I first used a "by"
function such as following :
temp <- by( data, data$categorical.factor , function(x) summary( glm( formula =
data$var1 ~ data$var2 , data = x , family = binomial("logit"))))
and it worked perfectly well
Next I tried to create a custom function that contains the latter syntax
regtab <- function(category, arg1, arg2 , data){
temp <-by( data, category , function(x) summary( glm( formula= arg1 ~ arg2 ,
data=x , family = binomial("logit"))))
temp
}
the resulting object of this function is a list with the correct subgroup
categories as its element's names but with the results of the entire dataset
logistic regression as its elements.
I can't figure out what's going on. Do you have any clues ?
Many thanks in advance,
Vincent Chouraki,
Interne de Santé Publique,
CHRU-Lille, France.
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