[R] step-wise and prediction
Spencer Graves
spencer.graves at pdf.com
Tue Jul 1 16:22:22 CEST 2003
Have you considered "predict(regrM)"?
J'espere que ces mots vous aideront.
Spencer Graves
ATHANASIA KAMARIOTIS wrote:
> I would like to know how to use the function step with "for" in order
> to predict.
> Id est:
>
> Let M , A, B ,C be vectors of length 15
>
> for(i in 1:5)
> {
>
> regrM<-lm(M[(1+i):(10+i)]~A[(1+i):(10+i)]+B[(1+i):(10+i)]+C[(1+i):
> (10+i)])
>
> sregrM<-step(regrM)
>
> and then I would like to compute the predicted value : M* of M, using
> the predictors selected by the function step.
> For example if i=1 and step gives us the model M~A,
> then in the "for", I want to compute M* by the means of A[11], and
> compare this value to the real value M[11] and so on.
>
>
>
> Merci d'avance ,
> Cordialement
> Athanasia
>
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