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Re: st: RE: Unordered Categorical Predictor Variable
From
William Buchanan <[email protected]>
To
"[email protected]" <[email protected]>
Subject
Re: st: RE: Unordered Categorical Predictor Variable
Date
Fri, 25 Jan 2013 11:05:13 -0800
If you can use Stata 12 the -contrast- post-estimation command has options to do this easily.
HTH,
Billy
Sent from my iPhone
On Jan 25, 2013, at 7:19, louis grandjean <[email protected]> wrote:
> Dear All,
>
> Thank you all so much for replying.
>
> Just to clarify even more in case it helps:
>
> My binary outcome is: Drug Resistant or Not Drug Resistant
>
> One of my predictor variables is: Bacterial Family which has 10
> categories/levels
>
> There are other predictor variables in the model too.
>
> The question I want to answer is: Is one bacterial family more likely
> to be drug resistant when compared to the others. But if possible I
> want to know this for all the bacterial families in the model.
>
> Deviation coding gives me the answer to the question is one bacterial
> family more drug resistant when compared to all the families
> (including itself) but this isn't quite what I want to do.
>
> Best wishes Louis
>
>
>
>
>
>
>
>
>
> On 24 January 2013 18:48, Lachenbruch, Peter
> <[email protected]> wrote:
>> i may be missing the point here, but why cant you use the factor variable coding (i.varname) you can vary the base variable. See factor variable in manual. comparing all possible factor codings doesn't make much sense since they will be dependent, and you can use contrasts for whatever you want.
>>
>> Peter A. Lachenbruch,
>> Professor (retired)
>> ________________________________________
>> From: [email protected] [[email protected]] on behalf of louis grandjean [[email protected]]
>> Sent: Thursday, January 24, 2013 7:08 AM
>> To: [email protected]
>> Subject: st: Unordered Categorical Predictor Variable
>>
>> Dear Statalist,
>>
>> I'm using Stata 11 and am struggling with how to best analyse an
>> unordered categorical predictor in a logistic regression.
>>
>> My categorical predictor is "bacterial family" so it doesn't make
>> sense to always compare one family to an arbitrarily chosen reference
>> family. What I want to do is compare each family in turn to all the
>> other families.
>>
>> I think deviation coding would give me one family vs the mean of all
>> the families, but I want to get one family vs the other famlies, and
>> obtain an odds ratio for each level.
>>
>> I've looked at xi3 but this doesn't seem to answer the problem.
>>
>> I'd be very grateful for your thoughts.
>>
>> Best wishes Louis
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>
> *
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