[Limdep Nlogit List] Help with clogit model

[Manit Satitsamitpong]

Dear Segio,


Thank you very much for your prompt reply.  So in this case i will have 4
generic choices for each choice set right? However, in my data here, I have
4 different GENERIC alternatives for each choice set. Let's say I have 4
choice and each choice sets contains 4 altenatives say A to D for choice set
one, E to H for choice set two, and so on.  Then I ask respondents to select
just one alternative from each choice set.  My question is "can I combine
all the data and run the model at the same time?" or if not, are there any
ways I can calculate the importance of each factor to the IPTV services
given the data I have collected already.  Thank you very much.


Best regards,
Manit Satitsamitpong



On Wed, Apr 28, 2010 at 9:37 PM, <scolombo at ugr.es> wrote:

> Dear Manit,
>
> In my understanding you haver a generic choice set. So, to run a
> conditional logit model (if this is what you are interested in) and you
> have choice sets with 4 GENERIC alternatives, you can simply call the
> alternatives A,B,C,D.
>
> Sergio.
>
> > Dear All,
> >
> > I am very new in this area. I really hope someone could help me with the
> > command or concept about the choice model that I am facing right now.
> >
> >
> > Suppose I would like to estimate customer preferences and the relative
> > importance of service factors of IPTV such as price per month (range of
> > price), video on demand feature (high or low), setup cost (high or low),
> > enhanced service (yes or no),and other 2 factors.  Then I created say 16
> > profiles of combinations of those factors (conjoint questions)  for
> > respondents to answer.  I understood that if I asked respondents to rank
> > all
> > those 16 profiles (combinations) then I can use SPSS to run the conjoint
> > analysis and then I can calculate the importance of each factor.
> >
> > My question here is what if I break down those 16 profiles into 4 choices
> > sets with each set contains 4 profiles (combinations) and then ask
> > respondents to choose the best choice (alternative) among each choice
> set.
> >  In this case, I don't think I can use clogit command to do so.  Because
> > clogit command asks me to provide the choice list (specific names of each
> > choice) but in this case I don't have a specific name for each
> combination
> > of choice set.
> >
> > clogit   ;lhs = choice
> >             ;Rhs = price, video, setup_cost, enhance_service
> >            ;Choices = ????
> > $
> >
> > Here I don't know what to use as the parameters for Choices since all
> > those
> > 16 combinations are different, unlike the transportation mode (air, bus,
> > car, train) given in Professor Greene's book.  Is there any way for me to
> > use LIMDEP or other software to run this data given the data that i have
> > (choice data instead of ranking data).   Thank you very much.  I am
> really
> > appreciated your time for reading this mail.
> >
> >
> > Best regards,
> > Manit Satitsamitpong
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> >
>
>
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