[Limdep Nlogit List] wtp in lclogit

[William Greene]

Charles.  The matrix for WTP is created before the program has detected
what type
of model will be computed.  The latent class logit model is a MNL model in
each
class.  Therefore, the WTP in each class is the same for every individual -
it is just the
same ratio of parameters for everyone.  Since it is not known which class
any individual
is in, it is not possible to discern which of those (two in your case)
ratio applies to a
given person.  For that reason, the matrix wtp_i is not filled.  It would
just be the same
value for each individual.
Regards,
Bill Greene

On Fri, Nov 24, 2017 at 12:49 PM, RAUX Charles <
Charles.Raux at laet.ish-lyon.cnrs.fr> wrote:

> Hello,
> I have a specification of latent class multinomial model (below)
>
> lclogit; choices=air, car, bus, train, none
>                ; lhs=choicem
>                ; model: U(air, car, bus, train) = <asca, ascc, 0, asct>
>                               + <da, dc, db, dt> * duration + pc * price
>                               / U(none) = anone
>                ; show model
>                ; pds=6; pts=2
>                ; wtp=da/pc, dc/pc, db/pc, dt/pc$
>
> This works fine, parameters are significant and the matrix wtpi is created
> with four columns and nearly 300 rows (the individuals). But filled only
> with zero. What is wrong?
> Charles Raux
>
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-- 
William Greene
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Stern School of Business, New York University
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