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Re: st: simple question


From   nicola.baldini2@unibo.it
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: simple question
Date   Fri, 22 Feb 2008 19:06:36 +0100

Why making calculations by hand, when -cmp- from SSC could make them for you?
Nicola

At 02.33 20/02/2008 -0500, Renuka Metcalfe wrote:
>Dear Statalisters
>
>I have estimated 2SLS regressions. The data is
>cross-section and the endogenous explanatory variable
>is binary, I have used
>
>. probit x x1 x2 x3 z
>
>where x = endogen. binary rhs variable
>
>I then took the predicted values and ran an -ivreg-
>with the predicted values. I find that the coefficient
>of the endogenous variable is 1.05 and is significant.
>I guess I could scale the endogenous variable without
>scaling anything as yet. I did this and I find the
>coefficient of the endogenous variable is now 0.105
>and has the same significance, that is, it is
>significant. But I am not certain, if would be
>correct. 
>I would be grateful, if anyone would let me know just
>scaling the endogenous variable is sufficient. I am
>not certain if I should scale the dependent variable
>of the ivreg and also the instrument I used in the
>first stage regression and the predicted values if
>this is possible.
>
>Thank you 

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