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Re: st: how to obtain Murphy and Topel asymptotic variance and covariance matrix in stata
Mark and other statalisters,
it looks like your suggested James Hardin article deals with the standwich
estimates of variance, which is asymptotically equivalent to Murphy-Topel.
Isn't there any way I could obtain exactly the Murphy-Topel correction?
Assistant Professor of Sociology
University of Washington
202 Savery Hall, Box 353340
Seattle, WA 98195-3340
----- Original Message -----
From: "Mark Schaffer" <M.E.Schaffer@hw.ac.uk>
To: <email@example.com>; "Hyojoung Kim"
Sent: Monday, September 13, 2004 2:14 PM
Subject: Re: st: how to obtain Murphy and Topel asymptotic variance and
covariance matrix in stata
> Have you looked at James Hardin's article in the Stata Journal (2002)?
> The abstract can be found at
> At it's a Stata Journal paper, it's likely to be pretty specific about how
> to go about implementing these variance estimators in Stata.
> Hope this helps.
> Quoting Hyojoung Kim <firstname.lastname@example.org>:
> > Dear statalisters,
> > i am a new member of the list and in need of your help in obtaining
> > K.M.
> > Murphy and R.H. Topel's (1985) asymptotic variance-covariance matrix
> > so as
> > to conduct a statistical significance test in a dichotomous probit
> > model and
> > in a negative binomial model.
> > The models I work with are bivarite probits defined in the
> > following:
> > Y1i = Xi*beta + ui
> > Y2i = Xi*gamma + uihat*lambda + ei
> > where Y1i is insurance coverage choice and Y2i is the
> > presence/absence of
> > car accidents. The key is to determine the statistical significance
> > of
> > lambda for uihat in the second equation while using Murphy and
> > Topel's
> > (1985) asymptotic variance-covariance matrix.
> > Alternatively, I also define Y2i in the second equation as a count
> > of
> > accidents instead of a dummy. In this case, should I have to
> > follow
> > different procedures to test the statistical significance with
> > Murphy and
> > Topel's (1985)? If so, how?
> > I thank you for the help in advance.
> > hyojoung
> > Hyojoung Kim
> > Assistant Professor of Sociology
> > University of Washington
> > 202 Savery Hall, Box 353340
> > Seattle, WA 98195-3340
> > (Phone) 206-543-9644
> > (Fax) 206-543-2516
> > (E-mail) email@example.com
> > *
> > * For searches and help try:
> > * http://www.stata.com/support/faqs/res/findit.html
> > * http://www.stata.com/support/statalist/faq
> > * http://www.ats.ucla.edu/stat/stata/
> Prof. Mark Schaffer
> Director, CERT
> Department of Economics
> School of Management & Languages
> Heriot-Watt University, Edinburgh EH14 4AS
> tel +44-131-451-3494 / fax +44-131-451-3008
> email: firstname.lastname@example.org
> web: http://www.sml.hw.ac.uk/ecomes
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