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From |
"Tim Burnett (ECO)" <Tim.Burnett@uea.ac.uk> |

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

Subject |
st: standard errors under compound marginal effects |

Date |
Mon, 12 Nov 2012 18:28:49 +0000 |

Dear all, I have a probit model where I am seeking to understand the compound marginal effect of a change in TWO independent (non-interacting) rhs variables. The command: margins, dydx(a) at(b=3 c=4 d=5) - obviously gives the marginal effect and standard error of a change in 'a' while: margins, dydx(e) at(b=3 c=4 d=5) - gives the marginal effect and standard error of a change in 'e' And because the variables enter into the probit independently then the total marginal effect is simply the sum of the above BUT is there a way to easily calculate the compound standard error? Although independently the change in each variable may be significant, I need to know if they cancel each other out... I hope this makes sense. Thanks, Tim -- Tim Burnett PhD Researcher Department of Economics & ESRC Centre for Competition Policy University of East Anglia Email: tim.burnett@uea.ac.uk Phone: +44 (0) 7793 116 522 Skype: timb318 ________________________________________ From: owner-statalist@hsphsun2.harvard.edu [owner-statalist@hsphsun2.harvard.edu] on behalf of sanja_lutzeyer@ncsu.edu [slutzey@ncsu.edu] Sent: 12 November 2012 16:46 To: statalist@hsphsun2.harvard.edu Subject: Re: st: Extracting numbers from code Hi Nick. Thank you for your reply. That is indeed very useful code - thank you. I have tried it with one of my questions which have less than 9 items and it works great! The only real problem of identification is really with the number 1 - which occurs in 1, 10 and 11. I never have a question with more than 11 items. Can you think of any way of any way around this? Thanks a ton for your help. Sanja * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/ * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**Re: st: standard errors under compound marginal effects***From:*Maarten Buis <maartenlbuis@gmail.com>

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