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From |
Maarten buis <maartenbuis@yahoo.co.uk> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Marginal Effects for Binary Response Models with Nonlinear Regressors |

Date |
Sun, 30 May 2010 07:08:10 -0700 (PDT) |

--- On Sun, 30/5/10, Olivia Bacha wrote: > Consider the following model 'logit y x(i)/sum_x(i)', where > variable x(i) is expenditure for individual i, then sum_x(i) > sum up total expenditures for all individuals, it is a ratio. > As stata uses delta method, mfx command will give me x(i)/ > sum_x(i) + delta , not x(i)+delta/[sum_x(i)+delta]. It is a > sort of same problem we face to calculate marginal effects > by including interactions in logit model. I am not sure whether the this is the same problem, if you added the proportion, then that means that you think that the proportion is the unit of interest, in which case I see no problem. However, if you disagree you can always compute the derivative by -nlcom- and let -nlcom- take care of the standard errors. Hope this helps, Maarten -------------------------- Maarten L. Buis Institut fuer Soziologie Universitaet Tuebingen Wilhelmstrasse 36 72074 Tuebingen Germany http://www.maartenbuis.nl -------------------------- * * 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/

**References**:**Re: st: Marginal Effects for Binary Response Models with Nonlinear Regressors***From:*Olivia Bacha <oliviabacha@gmail.com>

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