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From |
Austin Nichols <austinnichols@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Problem with margins after logit on a person period data |

Date |
Thu, 9 Jun 2011 12:17:24 -0400 |

Urmi Bhattacharya <ub3@indiana.edu> : This whole exercise is highly suspect--you are computing marginal effects over a sample of periods at risk, not people. Note that people are in your model for very different numbers of periods, but you are averaging over all periods; what is the goal here? You said you are "interested in the marginal effects of the variables on the probability of hazard" which I think means you want to measure the marginal effects of the variables on the conditional probability of leaving school (conditional on not having left yet) at different durations, which means you should calculate marginal effects for each sample of people still at risk, at different durations. These are unlikely to be very informative in the probability metric, however; odds ratios are used for a reason for such applications. On Wed, Jun 8, 2011 at 10:31 PM, Urmi Bhattacharya <ub3@indiana.edu> wrote: > Hi, > > I dropped one of the duration dummies durat1 and ran the following > logit regression .... * * 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/

**Follow-Ups**:**Re: st: Problem with margins after logit on a person period data***From:*Urmi Bhattacharya <ub3@indiana.edu>

**Re: st: Problem with margins after logit on a person period data***From:*Urmi Bhattacharya <ub3@indiana.edu>

**References**:**st: Problem with margins after logit on a person period data***From:*Urmi Bhattacharya <ub3@indiana.edu>

**Re: st: Problem with margins after logit on a person period data***From:*Richard Williams <richardwilliams.ndu@gmail.com>

**Re: st: Problem with margins after logit on a person period data***From:*Urmi Bhattacharya <ub3@indiana.edu>

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