On Aug 4, 2009, at 6:38 PM, Noah Silverman wrote:
> Thanks David,
>
> But HOW do I indicate the "grouping" variable in the formula?
Hard to tell. You have told us absolutely nothing about the problem.
Discrete variables cause no problems in formulas. Perhaps one of :
?factor
?cut
?quantile
>
> Thanks!
>
> -N
>
> On 8/4/09 3:37 PM, David Winsemius wrote:
>>
>>
>> On Aug 4, 2009, at 6:33 PM, Noah Silverman wrote:
>>
>>> Hi,
>>>
>>> Trying to setup a logistic regression model. (Something new to
>>> me. I
>>> usually use SVM.)
>>>
>>> The person explaining the concept explained to me that I can
>>> include a
>>> "group" variable so that the probabilities predicted by the model
>>> will
>>> be "per group"
>>>
>>> Does this make sense to anyone?
>>
>> Yes.
>>
>>> If so, how would I implement this?
>>> Using the glm or lrm function?
>>
>> Yes.
>>
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
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