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From |
"Sayer, Bryan" <BSayer@s-3.com> |

To |
"'statalist@hsphsun2.harvard.edu'" <statalist@hsphsun2.harvard.edu> |

Subject |
st: Marginal effects: at what value should you calculate? |

Date |
Wed, 2 Oct 2002 17:41:08 -0400 |

Korn, E. and Graubard, B. "Predictive Margins for Survey Data", Biometrics, about June 1999. You can ignore the survey design issues if they don't apply to you, and the rest still holds. BTW, they are only the same for mean based models, like OLS, and the s.e. are different. Bryan Sayer Statistician, SSS Inc. bsayer@s-3.com (p.s. I might not have the title just right, but it's close) -----Original Message----- From: epowers@moore.sc.edu [mailto:epowers@moore.sc.edu] Sent: Wednesday, October 02, 2002 3:20 PM To: statalist@hsphsun2.harvard.edu Subject: st: Marginal effects: at what value should you calculate? In "Econometric Analysis" by William H. Greene, 3rd edition. He states on page 876: "For computing marginal effects, one can evaluate the the expressions at the sample means of the data or evaluate the marginal effects at every observation and use the sample average fo the individual marginal effects. The functions are continuous, so Theorem 4.3 (the Slutsky theorem) applies; in large samples these will give the same answer. But that is not so in small or moderate sized samples. Current practice favors averaging the individual marginal effects when it is possible to do so." Is there any more definitive guidance out there for the values at which one should calculate marginal effects? While I agree that it makes intuitive sense to do the calculations at every observation and average, is there a theoretically sound reason to do so? Sincerely, Eric A. Powers Assistant Professor of Finance The Moore School of Business University of South Carolina Columbia SC, 29208 --- [This E-mail scanned for viruses by Declude Virus] * * 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/ * * 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/

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