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What difference does it make in estimation of model equation if a variable is specified in offset option in proc logistic?

I know, if I specify a variable in offset option; the variable will be included in the model equation with coefficient as 1. If the variable was already coming as a predictor then will it make any difference to the model equation if that variable is specified in offset option.

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    $\begingroup$ Yes it will alter the coefficient. The overall model should be the same (if I understand what you mean). But why not try it and see? You will not break SAS. $\endgroup$
    – mdewey
    Commented May 17, 2018 at 11:30
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    $\begingroup$ This is on topic. Offsets are a statistical issue, not a programming one. $\endgroup$
    – Peter Flom
    Commented May 18, 2018 at 10:48

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Partially answered in comments:

Yes it will alter the coefficient (1 will be subtracted). The overall model should be the same (if I understand what you mean). But why not try it and see? You will not break SAS. – mdewey

offsets is mostly used with poisson (or negative binomial) regression, to model rates. It is not often used with logistic regression, but you can find examples and discussion here: Offset in Logistic regression: what are the typical use cases?

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