[Limdep Nlogit List] WTp estimation
William Greene
wgreene at stern.nyu.edu
Wed Jul 25 04:50:05 AEST 2018
Medard. You have 16 labels. If B has 15 values in it, that is what
produced the
diagnostic. You don't have to use all the parameters that you label. But,
you have
to have the same number of labels as you do values.
/B. Greene
On Tue, Jul 24, 2018 at 1:56 PM, medard kakuru via Limdep <
limdep at mailman.sydney.edu.au> wrote:
> Dear Bill,
> Precisely, this is what I am doing.
>
> WALD; Labels=colb,
> colw,
> colc,
> tast,
> tex,
> smel,
> siz,
> pric,
> SD_colb,
> SD_colw,
> SD_colc,
> SD_tast,
> SD_tex,
> SD_siz,
> SD_smel,
> SD_pric
> ;start=b
> ;Var=Varb
> ;Fn1=-1*(colb/pric)
> ;Fn2=-1*(colw/pric)
> ;Fn3=-1*(colc/pric)
> ;Fn4=-1*(tast/pric)
> ;Fn5=-1*(tex/pric)
> ;Fn6=-1*(siz/pric)
> ;Fn7=-1*(smel/pric)$
>
>
> When I double click the B matrix, I see one column with 15 entries in it.
> How am I supposed to use the entries in the specification above, since I
> have arleady specified b as starting values?
>
> Thanks,
>
> Medard
>
>
>
> On Tue, Jul 24, 2018 at 8:42 PM, William Greene via Limdep <
> limdep at mailman.sydney.edu.au> wrote:
>
> > Medard. Look at your output in the output window. Then, double click B
> in
> > the
> > project window, and you will see what is contained in B in the right
> > order. When
> > you use ;Start=B ; Var = Varb you can then use the right ;Labels =
> list...
> > THEN
> > set up your functions.
> > /.B. Greene
> >
> > On Tue, Jul 24, 2018 at 12:34 PM, medard kakuru via Limdep <
> > limdep at mailman.sydney.edu.au> wrote:
> >
> > > Thanks Bill.
> > > However, I seem not to understand the matching and the submission you
> are
> > > talking about. Kindly give me a reference in the nlogit manual so that
> I
> > > read for more understanding.
> > > Thanks.
> > > Medard
> > > On Tue, Jul 24, 2018, 19:03 William Greene via Limdep <
> > > limdep at mailman.sydney.edu.au> wrote:
> > >
> > > > Yes you can. After estimation, double click on the B matrix and see
> > what
> > > > is in there.
> > > > Match it up against your output. Then submit B and VARB as the
> > > parameters
> > > > and
> > > > variance for the command.
> > > > /B. Greene
> > > >
> > > > On Tue, Jul 24, 2018 at 11:52 AM, medard kakuru via Limdep <
> > > > limdep at mailman.sydney.edu.au> wrote:
> > > >
> > > > > 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
> > > > > > > >>> _______________________________________________
> > > > > > > >>> Limdep site list
> > > > > > > >>> Limdep at mailman.sydney.edu.au
> > > > > > > >>> http://limdep.itls.usyd.edu.au
> > > > > > > >>>
> > > > > > > >>>
> > > > > > > >>
> > > > > > > >>
> > > > > > > >> --
> > > > > > > >> 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/5Mv5Cq7BKYtm3gZjtZ4Ubj?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
> > > > > > > >> _______________________________________________
> > > > > > > >> Limdep site list
> > > > > > > >> Limdep at mailman.sydney.edu.au
> > > > > > > >> http://limdep.itls.usyd.edu.au
> > > > > > > >>
> > > > > > > >>
> > > > > > > > _______________________________________________
> > > > > > > > Limdep site list
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> > > > > > > > http://limdep.itls.usyd.edu.au
> > > > > > > >
> > > > > > > _______________________________________________
> > > > > > > Limdep site list
> > > > > > > Limdep at mailman.sydney.edu.au
> > > > > > > http://limdep.itls.usyd.edu.au
> > > > > > >
> > > > > > >
> > > > > >
> > > > > >
> > > > > > --
> > > > > > 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/5Mv5Cq7BKYtm3gZjtZ4Ubj?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
> > > > > > _______________________________________________
> > > > > > Limdep site list
> > > > > > Limdep at mailman.sydney.edu.au
> > > > > > http://limdep.itls.usyd.edu.au
> > > > > >
> > > > > >
> > > > > _______________________________________________
> > > > > Limdep site list
> > > > > Limdep at mailman.sydney.edu.au
> > > > > http://limdep.itls.usyd.edu.au
> > > > >
> > > > >
> > > >
> > > >
> > > > --
> > > > 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/5Mv5Cq7BKYtm3gZjtZ4Ubj?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
> > > > _______________________________________________
> > > > Limdep site list
> > > > Limdep at mailman.sydney.edu.au
> > > > http://limdep.itls.usyd.edu.au
> > > >
> > > >
> > > _______________________________________________
> > > Limdep site list
> > > Limdep at mailman.sydney.edu.au
> > > http://limdep.itls.usyd.edu.au
> > >
> > >
> >
> >
> > --
> > 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/5Mv5Cq7BKYtm3gZjtZ4Ubj?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
> > _______________________________________________
> > Limdep site list
> > Limdep at mailman.sydney.edu.au
> > http://limdep.itls.usyd.edu.au
> >
> >
> _______________________________________________
> Limdep site list
> Limdep at mailman.sydney.edu.au
> http://limdep.itls.usyd.edu.au
>
>
--
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/5Mv5Cq7BKYtm3gZjtZ4Ubj?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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