[Limdep Nlogit List] Nlogit ;pds

[William Greene]

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/oFWtCvl0PoCYv4GRhQ2fjo?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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>

-- 
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/oFWtCvl0PoCYv4GRhQ2fjo?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