On Apr 5, 2010, at 5:32 AM, Nuno Miguel Madeira Veiga wrote:
>
> Hi,
> I am working on GLM models. However I am having some problems that I
> would like that someone give me some guidance
>
> One of the explanatory variables ERECTANGLE is not present in all
> the individual rows.
>
> 1 ? when I delete the rows for which the variable ERECTANGLE is
> missing I get the following results
> Null deviance: 290.884 on 774 degrees of freedom
> Residual deviance: 85.863 on 760 degrees of freedom
> AIC: 11385
>
> 2- when I run the model with all the rows including the null
> ECTANGLE I get the following results
> Null deviance: 480.75 on 1232 degrees of freedom
> Residual deviance: 140.30 on 1211 degrees of freedom
> AIC: 18113
>
>
> So I am curious on how the algorithm functions in terms of model
> adjustment
Which algorithm? You have not included any code.
What data? Most routines wouled either exclude missing data if
properly registered as NA. It you used a missing data indicator of
your own construction then who know what might be happening.
--
David.>
> I will be waiting for your answer Thanks
> Nuno
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David Winsemius, MD
West Hartford, CT