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

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

Subject |
RE: st: how to get marginal effect when dependent variable has ln function? |

Date |
Wed, 24 Jun 2009 08:42:03 +0000 (GMT) |

--- On Wed, 24/6/09, Garry Anderson wrote: > Below you mention > "while -glm- will give the percentage change in the > arithmatic mean of y for a unit change in x. " > > I was wondering if you could give an example please > of the -glm- command that would give the percentage > change in the arithmatic mean of y for a unit change > in x. So building on Roger's example in (Newson 2003), you can see that the geometric mean price of a domestic car is 5533 dollars while the arthmatic mean is 6072 dollars. The geometric mean of foreign cars is 7.7% larger than domestic cars while the arithmatic mean of foreign cars is 5.1% larger. *--------- begin example ---------- sysuse auto, clear generate logprice = log(price) generate byte baseline = 1 regress logprice foreign , /// eform(GM/Ratio) robust est store geometric glm price foreign , /// eform robust link(log) est store arithmatic est table geometric arithmatic, /// eform eq(1) *---------- end example ----------- Hope this helps, Maarten Roger Newson (2003) Stata tip 1: The eform() option of regress. The Stata Journal, 3(4): 445. http://www.stata-journal.com/article.html?article=st0054 ----------------------------------------- Maarten L. Buis Institut fuer Soziologie Universitaet Tuebingen Wilhelmstrasse 36 72074 Tuebingen Germany http://home.fsw.vu.nl/m.buis/ ----------------------------------------- * * 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/

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