[R] Step procedure and Akaike information criterion

[David Barron]

compare ?AIC with ?extractAIC, which explains the difference.

On 20/09/06, Emilia Rocco <rocco at ds.unifi.it> wrote:
> 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"
> Università di Firenze
> e-mail: rocco at ds.unifi.it
>
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-- 
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David Barron
Said Business School
University of Oxford
Park End Street
Oxford OX1 1HP