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st: Query: Nested-logit


From   siyama@who.int
To   statalist@hsphsun2.harvard.edu
Subject   st: Query: Nested-logit
Date   Wed, 9 Jul 2003 17:21:17 +0200

Dear Stata-listers,

A colleague of mine is trying to run a nested logit on the following 

	
__ Public
	
|	
							 ___ Yes__|
				  			|
|__ Private
							|
		Seek Health Care	|
							|___ No Care

After rearranging the data set, she can obtain the following "nlogittree"
output

. nlogittree choices type
tree structure specified for the nested logit model
        top --> bottom
        type       choices  
--------------------------
       type1        Public  
                   Private  
       type2       No Care 


.xi:nlogit chosen (choices = i.sex X2 X3) (type = i.sex X2 X3), group(hhid)
i.sex             _Isex_1-2           (naturally coded; _Isex_1 omitted)
tree structure specified for the nested logit model
        top --> bottom
        type       choices  
--------------------------
       type1        Public  
                   Private  
       type2       No Care  
unbalanced data
r(459);

Could the "unbalanced data" error be borne out of the lack of alternatives
beyond "Seek Health Care == No Care", or is more to do with a data
restructuring/ management issue.

Many thanks for your thoughts and suggestions in advance.

Amani





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