[R] Step procedure and Akaike information criterion

From: Emilia Rocco <rocco_at_ds.unifi.it>
Date: Wed 20 Sep 2006 - 11:58:42 GMT

Please can you help me
I have the following problem:
I have selected an lm model through the step procedure which visualize for each step the AIC value; then I have calculated for the initial model and the selected one the AIC using the funnction AIC. The results are different.What's happened?

Emilia Rocco
Dipartimento di Statistica "G. Parenti" UniversitÓ di Firenze
e-mail: rocco@ds.unifi.it

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