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st: Stata tool for a complex question


From   "Roger H. Coupal" <Coupal@uwyo.edu>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   st: Stata tool for a complex question
Date   Tue, 12 Jan 2010 05:46:48 -0700

Hi,

We are looking for code that estimates a random utility model with three indirect utility equations and 2 latent class variables (LCM) using data from a stated choice experiment. We are using a random utility model for the stated choice (A, B, or neither) and are finding heterogeneity across the survey sample that a LCM may best capture.
 
Basically the following situation is being modeled:
 - Choice 1, Choice 2, Choice 3 (neither 1 nor 2) which are mutually exclusive choices
 - indirect utility functions are estimated for each choice  of a given choice occasion:
 
Ch1=f(env attributes, sociodemo attributes)
Ch2=f(env attributes, sociodemo attributes)
Ch3=f(variables, sociodemo attributes differing from Ch1 and 2)
CH 1, 2, and 3 are (0,1) dependent variables and explanatory variables are mix of dummies and actual numbers. 
 
The likelihood function must take into account the probability of choosing a choice (1,2, 3), conditioned on being within a certain segment delineated by the latent class variable.
 
 Then a ML function is estimated where the parameters of CH1 and CH2 are the same but the parameters of CH3 are different. Is there a command in Stata that can task this problem? Thanks.

Is there tool in Stata that can accomplish this? thanks

Roger Coupal, Department Head
Agricultural and Applied Economics
University of wyoming
coupal@uwyo.edu
307.766.5539





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