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From |
Viktor Slavtchev <viktor.slavtchev@uni-jena.de> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: dirifit |

Date |
Wed, 05 Mar 2008 09:45:05 +0100 |

- Maarten, thank you very much!

I am also about to finish my PhD. I need three more months. I know how it feels.

Good luck

viktor

Maarten buis wrote:

--- Viktor Slavtchev <viktor.slavtchev@uni-jena.de> wrote:

My dependent variable are proportions in five categories which addThere 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

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.

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/

-----------------------------------------

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**References**:**Re: st: dirifit***From:*Maarten buis <maartenbuis@yahoo.co.uk>

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