st: Re: Capabilities of svymlogit

["R.E. De Hoyos" <redeho@hotmail.com>]

Jens,

In -mlogit- (or its survey version) the dependent variable is discrete and 
takes more than two values. If I understood you right, your data is set in a 
way that you observe several rows for the same individual each of them 
accounting for the different "participations". Therefore each column 
representing a different "participation" will only take values 0 and 1. If 
every individual "participates" only in one option then you can -reshape 
wide- your data to obtain a single variable (column) taking different values 
for the different chosen participations (say if you have 5 possible 
"participations" your new variable will take values 1 to 5).

help reshape

Once you have done that you can either -svyset- your data and 
run -svymlogit- or else use -mlogit- with [pw] and the cluster() option.

Alternatively you can use -clogit- with the present format of your data 
(-mlogit- and -clogit- are mathematically the same). Unfortunately -clogit- 
does not have a survey version, all you can do is to include the cluster() 
option.

clogit Y vars, id(personid)

I hope this helps,

Rafa
________________________
R.E. De Hoyos
Faculty of Economics
University of Cambridge
CB3 9DE, UK
www.econ.cam.ac.uk/phd/red29/

----- Original Message ----- 
From: "Jens Clausen" <JC@akf.dk>
To: <statalist@hsphsun2.harvard.edu>
Sent: Wednesday, July 13, 2005 1:55 PM
Subject: st: Capabilities of svymlogit



> Dear All,
>
> I am new to Stata, and trying to use it to analyze a survey dataset
> where some respondents have several positive responses (ie: "Have you
> participated in A?" -Yes, "Have you participated in B?" -Yes, etc.) and
> therefore have several lines in the dataset.
> Now my question is whether SVYMLOGIT is capable of handling this, and
> whether I am going about it the right way. I am using:
>
> svyset [pweight=WGT], psu(PERSONID)
> svymlogit Y <vars>, base(0)
>
> which produce estimates identical to
>
> mlogit Y <vars>, base(0)
>
> except for the standard errors. Is this correct?
>
> Thanks,
> Jens
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