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st: Rank ordered logit

From   "Mendieta Umana, Maria Paula" <>
To   "" <>
Subject   st: Rank ordered logit
Date   Tue, 8 Feb 2011 16:59:06 +0000

Hello everyone,
I am working with the rologit command to estimate a rank-ordered logit model and I want to perform a test  to find the "optimal" explotion depth using the procedure in the paper: "Exploiting Rank Ordered Choice Set Data Within the Stochastic Utility Model" R.G. Chapman and R. Staelin (1982) . 
The test is: 

-2{L(θ=θ(P=1+2))-[ L(θ=θ(1))+ L(θ=θ(2))]}

"In notational form θ(P=1+2), is the MLE for the pooled exploded rank ordered choice sets obtained by exploding to a depth of 2, θ(1),  is the MLE for the choice sets based only on the first most preferred alternative, and θ(2), is the MLE for the choice sets based only on the second preferred alternative." Page. 299

My specific question is how can I estimate the MLE  for the last term (based only in the second preferred alternative)? 

Thank you,

Maria Mendieta
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