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st: clogit or asclogit for choice experiment


From   Patty_FARE_Guelph Apichaya <pattria_ft@hotmail.com>
To   statalist <statalist@hsphsun2.harvard.edu>
Subject   st: clogit or asclogit for choice experiment
Date   Fri, 16 Apr 2010 12:36:55 +0000

 Hi all,
> 
>    I use STATA to analyze discrete choihce experiment. My choice design has 32 choice sets with each 2 options (A and B).
>  Each option include 3 factors: price (13,15,17), brand (AA,BB), production (animal,plant). The choice set will look like this.
>               OptionA                    OptionB
>  price           13                           15
>  brand          AA                           BB
>  production   animal                      plant
> 
> From 32 choice sets is divide into 4 block with each 8 choice sets. 
> Each individual (100 individuals) get 1 block (8 choice sets) and ask to choose between option A or B.
> 
> choice is 1 chosen option, 0 not chosen option
> set is same for two alternatives for each set i.e. there are 32 choice sets, it is repeated number from 1 to 32 and start it
>         again for the next 32 choice sets.
> 
> This is the code clogit choice price brand production, group(set)
> 
> From this code, the way that I code set (from 1 to 32), is it right?  
> 
>   I also want to include individual characteristics; gender, income, age.
>   
>  Can you suggest that which command clogit, asclogit, or mixlogit is appropriate for this situation?
> 
>    One thing is for asclogit has to have more than two options in choice sets. Hence Is it means I cannot use asclogit in my analysis?
> 
>   If I want to include two-way interaction effect in the analysis, how can I include it?
> 
>  Any suggestion would be great.
> 
> Pat

 		 	   		  
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