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st: The error "initial values not feasible, r(1400)" in mvtobit model


From   Nimanthika Lokuge <nimslkg@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: The error "initial values not feasible, r(1400)" in mvtobit model
Date   Wed, 3 Apr 2013 18:44:53 +0530

I'm estimating the demand for several food items using Almost Ideal
Demand System. There, I have to do censoring using the Multivariate
Tobit model.

I'm using Stata/SE 11.2 and my data set consists of nearly 18,500 households.

I used the following code & it returned an error as "initial values
not feasible, r(1400)".

//homogeneity//
constraint define 1 [q1]lnp1+[q1]lnp2+[q1]lnp3=0
constraint define 2 [q2]lnp1+[q2]lnp2+[q2]lnp3=0


//symmetry//
constraint define 3  [q1]lnp2=[q2]lnp1


global demand1 "(q1: w1 lnp1 lnp2 lnp3 lnxp)"
global demand2 "(q2: w2 lnp1 lnp2 lnp3 lnxp)"


mvtobit $demand1 $demand2, const(1 2 3)


Is there a way to tackle this error?


Many thanks in advance.
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