[Limdep Nlogit List] WTp estimation

[medard kakuru]

So i can't estimate wtp using the Wald command if one of the coeffecients
is nonrandom. I also get the same error message when I apply the wald
command after estimating a gmxl in utility space. Where could I be going
wrong?

Thanks in advance.
Medard

On Tue, Jul 24, 2018, 17:51 William Greene via Limdep <
limdep at mailman.sydney.edu.au> wrote:

> exactly right.  I agree
> Bill Greene
>
> On Tue, Jul 24, 2018 at 10:01 AM, Fredrik Carlsson <
> fredrik.carlsson at economics.gu.se> wrote:
>
> > You have one less parameter, so reduce the number of parameters in the
> > labels part of the Wald-command
> >
> > Fredrik
> >
> > Skickat från min iPhone
> >
> > > 24 juli 2018 kl. 15:53 skrev medard kakuru via Limdep <
> > limdep at mailman.sydney.edu.au>:
> > >
> > > Thanks Bill.
> > > I am facing another challenge. I use the wald command to estimate wtp
> > after
> > > estimating a mixed logit with all non-attribute coefficients given a
> > normal
> > > distribution and the syntax works. Since the standard deviation for one
> > > attribute was not significant, I re-specify the model and make that
> > > attribute non-random. Running the wald command after this specification
> > > gives me an error message that "wrong number of start values - need one
> > for
> > > each label". What could be the problem?
> > >
> > > Thanks.
> > >
> > > Medard
> > >
> > > On Sun, Jul 22, 2018 at 12:35 AM, William Greene via Limdep <
> > > limdep at mailman.sydney.edu.au> wrote:
> > >
> > >> Medard.  WTP for all variants of the RP logit model is described in
> > >> Chapter N29.  That would be good for the S-MNL and GMXL.  I'm
> > >> not sure what the G-MNL model is.  WTP is generally a ratio of
> > >> coefficients, though in RP models, the WTP is computed for each
> > >> individual.  P values for LR statistics are generally not computed.
> > >> I'm not sure what the P-value at 5% is.  You can use CALC to look
> > >> up critical values for chi-squared if you wish.  The function
> > >> CTB(prob,df) returns the critical value for probability prob with
> > >> degrees of freedom df.
> > >> Regards
> > >> /Bill Greene
> > >>
> > >> On Fri, Jul 20, 2018 at 5:22 AM, medard kakuru via Limdep <
> > >> limdep at mailman.sydney.edu.au> wrote:
> > >>
> > >>> Dear All,
> > >>> Kindly help me with the syntax for wtp in preference space. I am
> > running
> > >>> S-MNL, G-MNL and the GMXL models and want to compare WTP estimates
> for
> > >> the
> > >>> three models. I also want to compare these estimates with those
> > obtained
> > >>> from wtp-space model estimations. I understand that for a simple MXL
> > >> model,
> > >>> the syntax for wtp is just a ratio of attribute and cost
> coefficients.
> > Is
> > >>> it the case with the models I am estimating? I expected to find the
> > >> syntax
> > >>> in the Nlogit manual (section N33) but it's not listed.
> > >>>
> > >>>
> > >>> Secondly, I have seen the syntax for carrying out a loglikelihood
> ratio
> > >>> test and the syntax gives the LR statistic. How do i go further to
> get
> > a
> > >>> p-value (say at 5%) for the statistic?
> > >>>
> > >>> Thanks in advance.
> > >>>
> > >>> Regards, Medard
> > >>> _______________________________________________
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> > >>>
> > >>>
> > >>
> > >>
> > >> --
> > >> William Greene
> > >> Department of Economics
> > >> Stern School of Business, New York University
> > >> 44 West 4 St., 7-90
> > >> New York, NY, 10012
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> > >> Email: wgreene at stern.nyu.edu
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> > >> Editor in Chief: Journal of Productivity Analysis
> > >> Editor in Chief: Foundations and Trends in Econometrics
> > >> Associate Editor: Economics Letters
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> > >> Associate Editor: Journal of Choice Modeling
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> > >>
> > >>
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>
>
> --
> William Greene
> Department of Economics
> Stern School of Business, New York University
> 44 West 4 St., 7-90
> New York, NY, 10012
> URL: https://protect-au.mimecast.com/s/l30oCGvmB5ijRVjqTK1RHR?domain=people.stern.nyu.edu
> Email: wgreene at stern.nyu.edu
> Ph. +1.212.998.0876
> Editor in Chief: Journal of Productivity Analysis
> Editor in Chief: Foundations and Trends in Econometrics
> Associate Editor: Economics Letters
> Associate Editor: Journal of Business and Economic Statistics
> Associate Editor: Journal of Choice Modeling
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