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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