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st: VS: RE: mlogit with constraints
Thank you for your suggestion, Scott. However, it did not solve my problem since the comparison group was already multi==1. So, I still do not know what causes the message: redundant or inconsistent constraints.
I tried the following set-up of the constraints and these constraints seem to work in the estimation. However, I am not sure whether this is what I want, i.e. to constrain some of the coefficients related to the explanatory variables to be zero. In this case the constrained coefficient is dropped from the equation.
constraint define 1  L2debt
constraint define 2  debttoas23
1:  L2debt
2:  debttoas23
I would be grateful for any help with the constraints. I would like to know what is the difference between setting up coinstraints like above and my original constraints: constraint 1  L2debt=0 and constraint 2  debttoas23=0?
Thank you in advance.
Lähettäjä: Scott Merryman [mailto:email@example.com]
Lähetetty: to 11.11.2004 22:43
Aihe: st: RE: mlogit with constraints
I suspect you have defined a constraint for the base category (either
equation 2 or 3). You could use the basecategory(#) option to change the
value of dependent variable that is treated as the base category.
Hope this helps,
> -----Original Message-----
> From: firstname.lastname@example.org [mailto:owner-
> email@example.com] On Behalf Of Vartia, Niini
> Sent: Thursday, November 11, 2004 7:56 AM
> To: firstname.lastname@example.org
> Subject: st: mlogit with constraints
> Dear Statalisters,
> I trying to estimate a multinomial model with categorical dependent
> variable (multi) taking values 1,2 and 3. I would like to constrain some
> of the coefficients related to the explanatory variables to be zero. After
> defining the following constraints and estimating mlogit model I get the
> message below:
> constraint define 1  L2debt=0
> constraint define 2  debttoas23=0
> mlogit multi bktvolkasvu avhelieuribor m2togdp invr3 wint3 capint3
> prcosttot3 glvtot3 rdint1 tplkmyr ika loghenk forown L2profit fixtotot
> toas23 L2debt logcov, cluster(yrtunnew) constraints(1-2)
> redundant or inconsistent constraints
> I must be doing something wrong when specifying the constraints. I Would
> really be grateful for help in setting up the constraints.
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