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

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: help with fractional logit and marginal effects |

Date |
Tue, 15 Dec 2009 13:35:25 -0800 (PST) |

--- On Tue, 15/12/09, george joseph wrote: > The dependent variable, pengscore1 originally ranges from > 0-100(percentage of correct answers) which I rescaled to 0-1. > neavar are independent variables denoting school characteristics like > teacher pupil ratio, penetage of trained teachers , urban etc. My > question is the folllowing. > 1. Since I rescaled the dependent variable, how do I get > the correct marginal effects- should I use- mfx compute or mfx compute > , eyex. Since the dependent variable is rescaled how do I interpret > the marginal effects. It is all much simpler than you think, the transformation from percentages to proportions is just a linear transformation (divide by 100), so that does not change a thing. All you need to take care of that the unit of the dependent variable is now proportion and not percentage. If you want you can just multiply everything (marginal effects, their standard errors and confidence interval limits) with 100, to change the unit to percentages again. *------------------------ begin example ------------------------------ use "http://fmwww.bc.edu/repec/bocode/c/citybudget.dta";, clear glm governing minorityleft noleft popdens houseval, link(logit) robust mfx, at(minorityleft=0 noleft=0) *------------------------ end example -------------------------------- 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**:**st: help with fractional logit and marginal effects***From:*george joseph <gjosephresearch@gmail.com>

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