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

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: dirifit |

Date |
Tue, 4 Mar 2008 20:26:39 +0000 (GMT) |

--- Viktor Slavtchev <viktor.slavtchev@uni-jena.de> wrote: > My dependent variable are proportions in five categories which add > to one (y1-y5). I want to test the impact of a set of independent > variables (a, b, c), which are common for each y. > Additionally, I wan to test the impact of x1, x2, x3, x4, x5 whereat > x1 enters only the equation for y1, x2 enters only y2, and so on. > I think -dirifit- is the right technique. So I run fist: > dirifit y1 - y5, alpha(a b c) alpha1(x1) alpha2(x2) alpha3(x3) > alpha4(x4) alpha5(x5) However, as I am interested in the marginal > effects I have to use the > > -mu- option (if I've got it correctly). > My problem is, however, that with -mu- option I was not able to > specify that x1 hat to enter only y1, x2 only y2, ... > Any help is greatly appreciated. There are -mu1-, -mu2-, etc options, but they don't work well with -ddirifit- which I assume is the problem you are running in to. You could add x1 till x5 to all equation and add constraints that their parameters are 0 in all equations where you don't want them. Generally speaking the -ddirifit- command (the command that computes the marginal effects) is too fragile for my taste (I am one of the authors, so I don't consider it bad taste to beat up my own program). It is on my todo list to repair that. But, as I have said on some other occations on this list, I am in the process of finishing my dissertation, which has priority right now. -- Maarten ----------------------------------------- Maarten L. Buis Department of Social Research Methodology Vrije Universiteit Amsterdam Boelelaan 1081 1081 HV Amsterdam The Netherlands visiting address: Buitenveldertselaan 3 (Metropolitan), room Z434 +31 20 5986715 http://home.fsw.vu.nl/m.buis/ ----------------------------------------- __________________________________________________________ Sent from Yahoo! Mail. A Smarter Inbox. http://uk.docs.yahoo.com/nowyoucan.html * * 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**:**Re: st: dirifit***From:*Viktor Slavtchev <viktor.slavtchev@uni-jena.de>

**References**:**st: dirifit***From:*Viktor Slavtchev <viktor.slavtchev@uni-jena.de>

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