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Re: st: Offset variable
From
Richard Williams <[email protected]>
To
[email protected], "<[email protected]>" <[email protected]>
Subject
Re: st: Offset variable
Date
Mon, 09 Dec 2013 00:43:04 -0500
At 10:53 PM 12/8/2013, Stephen A. Crowder wrote:
I am developing an ordinal logistic regression model examining a
factor with several levels on my dependent variable. That part is
straight forward enough but I have a main independent variable that
ide like to control for in the examination of all of the other
independent variables. My question is would I need to make this an
"offset variable" in my models? I've been looking through the
literature and there's no clear answer available.
Sent from my iPhone
First off, if you have a new topic you should start a new thread
rather than reply to an old post. Even if you change the topic the
threading gets thrown off in the archives. Also the totally unrelated
extraneous text from the old thread that you quoted is distracting.
I think you probably just want to include the variable as another
independent variable. In Poisson and related models offset is
sometimes used as an alternative to the exposure option, e.g. it
provides a way of dealing with cases that have been at risk for
differing amounts of time. I don't think I have ever seen an example
that used offset in an ologit model. I'd be curious to know if there
are situations in which it makes sense.
I don't know if the offer is still good, but 9 years ago Nick Cox
said SJ would be interested in a paper that discussed the practical
uses of offset with commands like ologit:
<http://www.stata.com/statalist/archive/2004-10/msg00002.html>http://www.stata.com/statalist/archive/2004-10/msg00002.html
If somebody did successfully take Nick up on his offer I'd like to
know what the paper was.
-------------------------------------------
Richard Williams, Notre Dame Dept of Sociology
OFFICE: (574)631-6668, (574)631-6463
HOME: (574)289-5227
EMAIL: [email protected]
WWW: http://www.nd.edu/~rwilliam
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