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Re: st: margins after logit model
From
Tirthankar Chakravarty <[email protected]>
To
[email protected]
Subject
Re: st: margins after logit model
Date
Wed, 29 Dec 2010 15:42:46 -0800
One way to do this is to re-estimate with the group you want omitted
set as the base group in the logit regression:
*****************************************
webuse lbw, clear
logit low age lwt i.race smoke ptl ht ui
margins, dydx(race)
logit low age lwt b2.race smoke ptl ht ui
margins, dydx(race)
*****************************************
T
On Wed, Dec 29, 2010 at 3:36 PM, Haiyong Xu <[email protected]> wrote:
>
> Hi,
> Wish you all have wonderful holidays!
>
> My logit model and the output are as follows:
>
> logit psydrgnobzn i.female age i.year, vce(cluster cluster_id)
>
> Logistic regression Number of obs =
> 40284
> Wald chi2(4) =
> 422.81
> Prob > chi2 =
> 0.0000
> Log pseudolikelihood = -26350.649 Pseudo R2 =
> 0.0127
>
> (Std. Err. adjusted for 13428 clusters in
> cluster_id)
> ------------------------------------------------------------------------------
> | Robust
> psydrgnobzn | Coef. Std. Err. z P>|z| [95% Conf.
> Interval]
> -------------+----------------------------------------------------------------
> 1.female | .5114119 .0357798 14.29 0.000 .4412848
> .5815389
> age | -.0191765 .0023834 -8.05
> 0.000 -.0238479 -.0145051
> |
> year |
> 2006 | .154101 .0147308 10.46 0.000 .1252292
> .1829728
> 2007 | .2495566 .0171274 14.57 0.000 .2159875
> .2831257
> |
> _cons | .5000495 .1866511 2.68 0.007 .13422
> .865879
> ------------------------------------------------------------------------------
>
> After the logit model, I run margins command to get the marginal effect.
> . margins, dydx(year)
>
> Average marginal effects Number of obs =
> 40284
> Model VCE : Robust
>
> Expression : Pr(psydrgnobzn), predict()
> dy/dx w.r.t. : 2006.year 2007.year
>
> ------------------------------------------------------------------------------
> | Delta-method
> | dy/dx Std. Err. z P>|z| [95% Conf.
> Interval]
> -------------+----------------------------------------------------------------
> year |
> 2006 | .0351202 .0033485 10.49 0.000 .0285573
> .0416832
> 2007 | .0575292 .0039259 14.65 0.000 .0498345
> .0652239
> ------------------------------------------------------------------------------
> Note: dy/dx for factor levels is the discrete change from the base level.
>
> The year variables has three values 2005, 2006 and 2007. Stata automatically
> set 2005 as the omit group. I wonder if I can set 2006 as the reference
> group so that I can get the margin effect between 2006 and 2007.
>
> Thanks.
> Haiyong
>
>
>
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--
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recursive class signs r, such that neither v Gen r nor Neg(v Gen r)
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*
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