Re: st: Problems with Margeff

["Dr. Bartus" <tamas.bartus@uni-corvinus.hu>]

Dear Neli,

Why are you surprised that the sign of a marginal effect differs from the sign of the corresponding coefficient?
In multinomial logit, this is possible because multinomial probabilites are fractions. Just go through the math...

Tamas

(author of margeff)

10/11/01-i dátummal Neli Demireva <neli.demireva@sociology.ox.ac.uk> írta:

Dear Stata Users,

I am looking into migrants' transitions from unemployment to employment.

I am using a mulltinomial logistic regression for this purpose with the following syntax line:
xi:mlogit activity age agesq  i.famstat i.housing i.isced i.natz i.country i.anyclaim Ldurun Lmethod w1yr  if L1.activity==2 & sex==1 [pw=wt], cluster(persid) baseoutcome(1)

Ldurun and Lmethod are lagged variables. The cluster option is needed because individuals are represented with more than one observation.

If I use the 'mfx' command to compute marginal effects, I get different signs of the coefficient and the m.e. estimate. I thought I will use margeff. Neither margeff, nor margeff, percent seem to be working (although I have margeff installed). Only margeff, outcome (2) produces m.e. estimates still different in sign from the coefficients.

Any ideas as to why this is happening and suggestions how to proceed?

With best wishes,

Neli




Dr. Neli Demireva
Leverhulme Post-Doctoral Researcher
Nuffield College Research Fellow
Department of Sociology
Manor Road
OX1 3UQ
Oxford
Tel: 01865 286177
http://oxforddiversityproject.weebly.com/neli-demireva.html
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-- 
------------------------------------------------

Tamas Bartus, PhD
Associate Professor, Institute of Sociology and Social Policy
Corvinus University, Budapest 
1093 Budapest, Közraktár utca 4-6.
Phone:  +36-1-482-7301         
Fax:      +36-1-482-7348
Homepage: http://web.uni-corvinus.hu/bartus
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