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From |
"Markiewicz, Agnieska" <Agnieszka.Markiewicz@econ.kuleuven.ac.be> |

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

Subject |
RE: st: marginal effects for ordered logit |

Date |
Wed, 10 Nov 2004 15:51:56 +0100 |

Dear Marteen, I was following your discussion with Pradeep on calculation of marginal effects of quadratic terms. I have the impression that the command nlcom is not available in the 8 release. (I have only the 7) Is there any other command I could use instead? Aga -----Original Message----- From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of maartenbuis Sent: Thursday, November 04, 2004 5:20 PM To: statalist@hsphsun2.harvard.edu Subject: Re: st: marginal effects for ordered logit Dear Aga, The marginal effect you want is just the slope of a tangent line of these graphs at a specific value of your explanatory variable (often the mean of the explanatory variable), so the marginal effect just shows part of the information represented by the graph. Furthermore - mfx - won't calculate the marginal effects you want if you include a quadratic term, so you'd probably have to do that manually. Alternatively you could use the fact that the ologit is linear in the log(odds), i.e. the log(odds) of belonging to one group versus all `lower' groups is a linear function of the explanatory variables. So you could plot or tabulate the odds ratio for various values of your explanatory variable. Have a look at chapter 5 of `Regression models for categorical dependent variables using Stata', by Scott Long and Jeremy Freese if you want to know more than I can tell you through this list. Maarten --- <Agnieszka.Markiewicz@e...> wrote: > I was actually trying to plot my results but they don't look very > convincing. Accordingly to your remark, the probability of belonging to > one of the classes changes and my graphs don't provide any clear > explanation. Thus I still would like to interpret my results without > graphs. * * 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/

**Follow-Ups**:**Re: st: marginal effects for ordered logit***From:*"maartenbuis" <maartenbuis@yahoo.co.uk>

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