Hi all Im in desperate need of help. Im working with a grouped data object, called Orthodont in the nlme package in R, and am trying to fit various models (learning methods for my thesis), but one of the variables in the object is numeric, (age) and I need it to be a factor. Ive tried: as.factor(Orthodont$age) as.factor(as.character(Orthodont$age)) and various other things, but when I then check the class of the variables using sapply(Orthodont, data.class) I still get age as numeric Also, sex is a factor, but for the models Im fitting I need it to be coded as a binary variable with values (-1) for males and (+1) for females, and I dont know how to do this either. Please help-Im losing my mind .!
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