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Re: st: weird margins

From   Rich Steinberg <>
Subject   Re: st: weird margins
Date   Fri, 02 Oct 2009 14:26:02 -0400

You are entirely right.  My embarrassed thanks.

Austin Nichols wrote:
Just guessing, but do you mean
instead of

On Thu, Oct 1, 2009 at 3:31 PM, Rich Steinberg <> wrote:
I run a tobit because of left censoring at zero, then want to use margins to
predict the marginal slope for the observable dependent variable atotgiv.

Everything looks ok except in the output appears
Expression: E(atotgiv*|atotgiv>otherrelh), predict (ystar(0,.))

The appearance of otherrelh in this expression is mysterious.  This is
another dummy variable used as a control.  I didn't program it to look at
that, and I think it should read, instead, E(atotgiv*|atotgiv>0), etc.

Is this a bug?  A mistake on my part?  A misunderstanding?

Here is the exact command and headers for the results:

margins, predict(ystar(o,.)) dydx( earn01 assety01 welfare01 nonwelfare01
annuapprecinh annuownwealthn annuheq )

Average marginal effects                          Number of obs   =
Model VCE    : Robust

Expression   : E(atotgiv*|atotgiv>otherrelh), predict(ystar(o,.))
dy/dx w.r.t. : earn01 assety01 welfare01 nonwelfare01 annuapprecinh
             annuownwealthn annuheq


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Rich Steinberg
Department of Economics, 516 Cavanaugh Hall
Indianapolis, IN 46202-5140

"Unanswered email since 1955"

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