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

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Re: joint effect of two endogenous variables |

Date |
Tue, 24 Aug 2010 16:05:52 +0000 (GMT) |

--- On Tue, 24/8/10, xueliansharon wrote: > my y1 is people's age started to work, y2 is years of schooling, > what I want to get is the joint effect when people started to > enter the labor market one year later and receive one more year of > schooling. It sounds like the unit of both variables is years, but they are obviously still different, a year of education is not the same thing as getting a year older, so you'll still need to standardize. > But I didn't understand why "constraining the effects to be > equal" could compute the joint effect, could you explain it more > explicitly? You'll need to conceptually define what a "joint effect" is, and you could see constraining the effects to be equal as one such definition. By proposing one such definition, I side steped the most important part: thinking about what it is that you want to measure. So instead of focussing on technique, I would first try to find a reason why one might want to know the effect of the combination of these two variables. If you can come up with such a story, then you can often derive the type of constraint that you need to apply. If you cannot come up with such a story, then estimating a "joint effect" just doesn't make sense, and you'll need to find another solution. 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/

**Follow-Ups**:**st: Re: joint effect of two endogenous variables***From:*xueliansharon <xuelianstata@gmail.com>

**References**:**st: Re: joint effect of two endogenous variables***From:*xueliansharon <xuelianstata@gmail.com>

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