[Limdep Nlogit List] Nlogit ;pds

[Mahsa Taslimi]

Thank you. it is very helpful.

Best regards
Mahsa

On Thu, Dec 19, 2019 at 10:33 PM William Greene via Limdep <
limdep at mailman.sydney.edu.au> wrote:

> Mahsa.  You can ignore the 392 (= 784/2)  You should be using PDS=8
> in all cases.  The problem is that the program is reconciling the general
> use of PDS for by LIMDEP with the special counting rule for the NLOGIT
> multinomial choice commands.  I'm assuming that you really do have 3
> alternatives every time and that the choice set is correctly set for all
> the
> choice models.
> ./B. Greene
>
> On Thu, Dec 19, 2019 at 1:53 PM Mahsa Taslimi via Limdep <
> limdep at mailman.sydney.edu.au> wrote:
>
> > Thanks, Dr. Greene for replaying.
> > I have two more questions left, I have 98 individuals and 8 choice cards
> > and 3 alternatives in each choice cards and 2352 rows. all Data are the
> > panel.
> >
> > I am using RPLOGIT, LCLOGIT, and LCRPLOGIT commands in the NLOGIT. based
> on
> > your comment, I should use;pds=8. is it right?
> > But in LCRPLOGIT the results of estimation says that the N=784, fixed
> > number of observations is 2, the lcm model with panel 392  groups and the
> > WTP are for 392 groups. how should I interpret 392? I don't know what is
> > it?
> >
> > Thanks again
> > Mahsa
> >
> >
> >
> > On Thu, Dec 19, 2019 at 9:28 PM William Greene via Limdep <
> > limdep at mailman.sydney.edu.au> wrote:
> >
> > > Mahsa.  For commands that have verb NLOGIT, the ;PDS is the number of
> > > choice
> > > tasks.  One of my data sets has 12,800 rows of data.  There are 400
> > > individuals in
> > > the sample.  Each individual faces 8 choice tasks.  Each choice task
> > > involves 4
> > > alternatives.  So, the number of choice tasks in the data set is
> > 12,800/4 =
> > > 3,200.
> > > For purposes of "panel data," the PDS for NLOGIT commands would be
> > ;Pds=8.
> > > Note that ;PDS for other commands such as PROBIT would be Pds=32, but
> of
> > > course,
> > > this is wrong for multinomial choice data.
> > > /B. Greene
> > >
> > > On Thu, Dec 19, 2019 at 11:50 AM Mahsa Taslimi via Limdep <
> > > limdep at mailman.sydney.edu.au> wrote:
> > >
> > > > Hi
> > > >
> > > > I am estimating RPL, LC, and LC-RPL models. I have a question about
> the
> > > > observation and sample size.
> > > > h have 2352 observations which are 784 in Nlogit. and the RpL got ;
> PDS
> > > for
> > > > the fixed variable or the grouping.
> > > > the estimation says I have 784 observations and the RPL or LC models
> > got
> > > 98
> > > > groups and 2= pds. actually the WTP wil be 392 rows. what is this
> 392?
> > is
> > > > it the observations? or what?
> > > >
> > > > How does it work? i am learning it by myself. can anyone help me with
> > > this?
> > > >
> > > > Thanks
> > > > Mahsa
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> > > >
> > >
> > > --
> > > William Greene
> > > Department of Economics, emeritus
> > > Stern School of Business, New York University
> > > 44 West 4 St.
> > > New York, NY, 10012
> > > URL: https://protect-au.mimecast.com/s/ifFSCVAGXPtWMz0DCGI6at?domain=people.stern.nyu.edu
> > > Email: wgreene at stern.nyu.edu
> > > Ph. +1.646.596.3296
> > > Editor in Chief: Journal of Productivity Analysis
> > > Editor in Chief: Foundations and Trends in Econometrics
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> >
> >
>
> --
> William Greene
> Department of Economics, emeritus
> Stern School of Business, New York University
> 44 West 4 St.
> New York, NY, 10012
> URL: https://protect-au.mimecast.com/s/ifFSCVAGXPtWMz0DCGI6at?domain=people.stern.nyu.edu
> Email: wgreene at stern.nyu.edu
> Ph. +1.646.596.3296
> 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
> _______________________________________________
> Limdep site list
> Limdep at mailman.sydney.edu.au
> http://limdep.itls.usyd.edu.au
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>