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Re: st: Adjusted Prevalence from Logistic models


From   Dean Eurich <deurich@ualberta.ca>
To   <statalist@hsphsun2.harvard.edu>
Subject   Re: st: Adjusted Prevalence from Logistic models
Date   Wed, 24 Oct 2012 08:31:44 -0600

Thanks all for the help.

Dean (p.s. I just have one variable for dwelling called "rural" which is
coded as 1=rural and 0=urban  - dummy variable)

On 12-10-24 2:18 AM, "Richard Williams" <richardwilliams.ndu@gmail.com>
wrote:

>At 01:18 AM 10/24/2012, Dean Eurich wrote:
>>Hi all,
>>
>>A simple question. If I run a logistic model:
>>
>>logistic BB age sex rural
>>
>>I get the OR for the effect of rural (which is a flag for rural=0 or
>>urban=1 dwelling) on the use of beta blockers (medication used to
>>treat cardiovascular disease).
>>
>>A reviewer has asked for us to present the adjusted prevalence for
>>the use of BB by rural and urban status. I am not to sure how to do this.
>>
>>I assume I could use the 'margin' command.
>>
>>So would it be as simple as
>>
>>  margins rural, atmeans
>>
>>(Although I realize I could do it as specific levels of sex and age as
>>well)
>>
>>Thanks
>>
>>Dean
>
>I'm not totally sure how you want to adjust. But if you want to use
>-margins- you should use factor variable notation, e.g.
>
>logistic BB age i.sex i.rural
>margins rural, atmeans
>
>In general, I am not crazy about the atmeans option, and I especially
>don't like it when you have a variable like sex in the model. You'll
>be plugging in something like .5 for sex (the average person is half
>male, half female?) I'd rather use the default -asobserved- or plug
>in specific values or ranges of values for the other variables. For
>some highlights of what you can do with margins, see
>
>http://www.nd.edu/~rwilliam/stats/Margins01.pdf
>
>As a sidelight, when you say rural=0 or urban=1, that sort of sounds
>to me like heads I win, tails you lose. Aren't rural=0 and urban=1
>the same thing?
>
>-------------------------------------------
>Richard Williams, Notre Dame Dept of Sociology
>OFFICE: (574)631-6668, (574)631-6463
>HOME:   (574)289-5227
>EMAIL:  Richard.A.Williams.5@ND.Edu
>WWW:    http://www.nd.edu/~rwilliam
>
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