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From |
"Millimet, Daniel" <millimet@mail.smu.edu> |

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

Subject |
st: RE: xtreg fixed effect with time trend; constant |

Date |
Thu, 17 Jul 2003 09:01:42 -0500 |

It's probably blowing up if you code the year as, say, 1999. Then the constant becomes the mean value of y fixing all X's at zero and time at zero. This is "right," just not relevant. If you plug in the average value of the year in the trend, you should get sensical values of y. Alternatively, rescale the time variable to start in year 0. Dann ---------------------------------------------------------- Daniel L. Millimet, Assistant Professor Department of Economics Box 0496 SMU Dallas, TX 75275-0496 Phone: 214.768.3269 Fax: 214.768.1821 http://faculty.smu.edu/millimet ---------------------------------------------------------- > -----Original Message----- > From: david reinstein [mailto:daaronr@yahoo.com] > Sent: Thursday, July 17, 2003 4:37 AM > To: statalist@hsphsun2.harvard.edu > Subject: st: xtreg fixed effect with time trend; constant > > I try to do an xtreg fixed effect including a > variable that represents the year of the data > observation. I assume the coefficient on this should > be an an average time trend. The coefficients I get > are plausible, but the "constant" blows up weirdly -- > to a level much higher (or lower) than the average of > the dependent variable could possibly be. > Anyone know why? > Anyone know how to impose a time trend (or better, > several time trends for several subgroups) within the > context of a panel FE model? > Thanks, > David > > > __________________________________ > Do you Yahoo!? > SBC Yahoo! DSL - Now only $29.95 per month! > http://sbc.yahoo.com > * > * 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**:**st: Re: RE: xtreg fixed effect with time trend; constant***From:*"Scott Merryman" <smerryman@kc.rr.com>

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