[R] GLM

[David Winsemius]

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