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Re: st: logistic regression


From   "meena khan" <meena_25@hotmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: logistic regression
Date   Mon, 12 Mar 2007 10:46:03 +0000

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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