[R] Generalized linear models (GLM)

[mathallan]

Actually both max.loss and loss are known values (in dollars). I'm very much
doubt, what to choose.


glm(max.loss~loss,family=gaussian(link="identity")

or

glm(formula = sum ~ claims * as.factor(grp), family = gaussian(link =
"identity"))

or
glm(loss~max.loss,family=gaussian(link="identity")

we have to look at gaussian and gamma, with link identity and log.

But my problem is what is going to be between the ~



David Winsemius wrote:
> 
> I think you are off-track because max.loss does not sound like a  
> proper Y variable. Because max.loss is an amount that is known, in the  
> insurance applications I have seen it would have been modeled within  
> an offset term. Many of the examples have used number of ships or  
> buildings or the person years of exposure but I do not see that the  
> general strategy is limited to only such  considerations.
> 
> I would also suggest that you consider links other than Gaussian,  
> perhaps negative binomial.
> 
> The task for the analyst is then to translate output from the chosen  
> model into interpretable meaning on the scale of interest, but I  
> assume your course instructor will help with that.
> 
> -- 
> David Winsemius
> On Apr 28, 2009, at 11:34 AM, mathallan wrote:
> 
>>
>> Hi
>>
>> I got a dataset
>>
>>       loss     max.loss   grp
>> 1     10         50         2
>> 2     15         33         1
>> 3     18         49         2
>> 4     33         38         1
>> 5      8          50         3
>> 6     19         29         1
>> 7     22         51         4
>> 8     50         50         2
>> 9     16         38         1
>> 10    24         30         3
>>
>> were loss and max.loss are monetary values (in dollar). Grp is group  
>> number.
>>
>> By use of GLM, I have to determine the effect of max.loss and grp (and
>> interactions between them) on loss. My question is how to do this.
>>
>> Is it something like
>>
>> glm(max.loss~loss,family=gaussian(link="identity")
>>
>> were ofcourse I can change gaussian with Gamma,... and link with  
>> log,...
>>
>> But am I on right track, or what should I change?
>>
>>
>> Thanks
>> -- 
>> View this message in context:
>> http://www.nabble.com/Generalized-linear-models-%28GLM%29-tp23279588p23279588.html
>> Sent from the R help mailing list archive at Nabble.com.
>>
>> ______________________________________________
>> R-help at r-project.org mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide
>> http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
> 
> David Winsemius, MD
> Heritage Laboratories
> West Hartford, CT
> 
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
> 
> 

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