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Re: st: logistic regression


From   "Sebastian F. Büchte" <sfbuechte@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: logistic regression
Date   Mon, 12 Mar 2007 11:55:34 +0100

Meena,

so you receive two measures (outcome information) from one
measurement? Do you  consider the two measure as two independet ones?

Regards
Sebastian

On 3/12/07, meena khan <meena_25@hotmail.com> wrote:
Hi,
Each individual is only measured once but the independent SNP variable has 2
measures for each person which is why it grouped in this way. the SNP is
binary so there are 3 possible combinations for each person (00, 01 or 11)

Thanks
Meena


>From: "Sebastian F. Büchte" <sfbuechte@gmail.com>
>Reply-To: statalist@hsphsun2.harvard.edu
>To: statalist@hsphsun2.harvard.edu
>Subject: Re: st: logistic regression
>Date: Mon, 12 Mar 2007 11:25:45 +0100
>
>Looking at your example data, your statement "only one variable (SNP)
>is different in each person" appears to be inconsistent with the
>presented data (check rows for id = 2).
>
>I would help a lot to understand how your data is generated. Multiple
>treatments/measurements for a number of subjects? Is this perhaps
>panel data? ...
>
>regards
>sebastian
>
>On 3/12/07, meena khan <meena_25@hotmail.com> wrote:
>>Hello,
>>
>>I have a dataset where all variables are replicated twice for each
>>subject,
>>only one variable (SNP) is different in each person:
>>
>>ID          SNP     Event    X1         X2
>>
>>1             0          0          a          a
>>1             1          0          a          a
>>2             1          1          b          b
>>2             1          1          b          b
>>
>>I would like to know if it is correct to cluster by ID in a normal
>>logistic
>>regression model? Conditional logistic regression does not work as when I
>>group it by ID as there is no variation within the groups. The logistic
>>cluster option seems correct to me when I read the Stata help – it adjusts
>>the SEs for intragroup correlation which is what I want. I just want to
>>check if it is right. Thanks
>>
>>Meena
>>
>>
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