Hello together,
I would like to predict my fitted values on a new dataset. The original dataset
consists of the variable a and b (data.frame(a,b)). The dataset for prediction
consists of the same variables, but variable b has a constant value (x) added
towards it (data.frame (a,b+x).
The prediction command returns the identical set of predicted values as for the
original dataset yet I would have expected them to change due to b+x.
Were have I gone wrong?
Heres my code:
orig.frame<-data.frame(y,a,b)
pred.frame<-data.frame(a,b+x)
attach(orig.frame)
modela<-glm(y~a+b,binomial)
pr<-predict(modela,newdata=pred.frame,type="response")
many thanks
Chris
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