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st: exchanging the outcome and exposure in logistic reg


From   Ricardo Ovaldia <[email protected]>
To   [email protected]
Subject   st: exchanging the outcome and exposure in logistic reg
Date   Sat, 24 Jan 2009 10:47:28 -0800 (PST)

Dear all,

I recall a discussion on the list a while back regarding this topic, but I did find it in the archives.

In a case-control study the traditional way of modeling a logistic regression is:

logistic case died x1 x2 x3 x4

where case is the presence of cancer (0/1) for example.

Now, an investigator wants me to fit:

logistic died case x1 x2 x3 x4

and I am not sure that this is correct any longer. I recall that it is okay to “flip” the outcome and exposure variables if there are no additional covariates, however, with covariates (x1, x2 …) that is not okay anymore. Is that correct?

Thank you,
Ricardo

Ricardo Ovaldia, MS
Statistician 
Oklahoma City, OK



      

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