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From | Richard Williams <Williams.NDA@comcast.net> |
To | statalist@hsphsun2.harvard.edu, statalist@hsphsun2.harvard.edu |
Subject | Re: st: margeff/margins discrepancy |
Date | Sun, 25 Apr 2010 23:07:39 -0500 |
At 09:14 PM 4/25/2010, Michael Mitchell wrote:
Greetings Hmmm... ran your code and I get the same coefficient and se from -margeff- and -margins- using Stata 11, see below
Ok, I have a theory. Is there any chance you are using the old version of margeff, that has now been renamed margeff8? Because margeff8 gives the same answer as margins while margeff does not:
. margeff8 Average marginal effects on Prob(married==married) after probit ------------------------------------------------------------------------------ married | Coef. Std. Err. z P>|z| [95% Conf. Interval] -------------+---------------------------------------------------------------- wage | -.0071433 .0150751 -0.47 0.636 -.03669 .0224033 ------------------------------------------------------------------------------ . margins, dydx(wage) Average marginal effects Number of obs = 78 Model VCE : OIM Expression : Pr(married), predict() dy/dx w.r.t. : wage ------------------------------------------------------------------------------ | Delta-method | dy/dx Std. Err. z P>|z| [95% Conf. Interval] -------------+---------------------------------------------------------------- wage | -.0071433 .0150751 -0.47 0.636 -.0366901 .0224034 ------------------------------------------------------------------------------ . margeff Average partial effects after probit y = Pr(married) ------------------------------------------------------------------------------ variable | Coef. Std. Err. z P>|z| [95% Conf. Interval] -------------+---------------------------------------------------------------- wage | -.0071375 .0149933 -0.48 0.634 -.0365238 .0222489 ------------------------------------------------------------------------------ ------------------------------------------- Richard Williams, Notre Dame Dept of Sociology OFFICE: (574)631-6668, (574)631-6463 HOME: (574)289-5227 EMAIL: Richard.A.Williams.5@ND.Edu WWW: http://www.nd.edu/~rwilliam * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/