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Re: st: set reference dependent var category in longitudinal mlogit panel
From
[email protected] (Jeff Pitblado, StataCorp LP)
To
[email protected]
Subject
Re: st: set reference dependent var category in longitudinal mlogit panel
Date
Tue, 13 Aug 2013 22:27:08 -0500
Jason Bond <[email protected]> is using -gsem- and wants to change the base
outcome for a multinomial logit model:
> I'm trying to estimate a longitudinal multinomial panel model using gsem.
> The default dependent variable reference category is the first.is there an
> easy way to change this to a different category? 'baseoutcome(x)' is not
> allowed as an option and 'char depvar[omit] x' doesn't do anything.
Jason can use the 'b' operator to specify the base outcome for a multinomial
logit outcome variable in -gsem-. The 'b' operator is part of factor
variables notation, see -help fvvarlist-.
In the following Stata log we use level 3 as the base for outcome 'insure'.
This example is based on '[SEM] example 37g'.
***** BEGIN:
. webuse gsem_sysdsn1
(Health insurance data)
. gsem (b3.insure <- i.nonwhite)
Iteration 0: log likelihood = -556.59502
Iteration 1: log likelihood = -551.78935
Iteration 2: log likelihood = -551.78348
Iteration 3: log likelihood = -551.78348
Generalized structural equation model Number of obs = 616
Log likelihood = -551.78348
------------------------------------------------------------------------------
| Coef. Std. Err. z P>|z| [95% Conf. Interval]
-------------+----------------------------------------------------------------
1.insure <- |
|
1.nonwhite | -.3779586 .407589 -0.93 0.354 -1.176818 .4209011
_cons | 1.941934 .1782185 10.90 0.000 1.592632 2.291236
-------------+----------------------------------------------------------------
2.insure <- |
|
1.nonwhite | .2828627 .3977302 0.71 0.477 -.4966742 1.0624
_cons | 1.754019 .1805145 9.72 0.000 1.400217 2.107821
-------------+----------------------------------------------------------------
3.insure | (base outcome)
------------------------------------------------------------------------------
***** END:
--Jeff
[email protected]
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