[Limdep Nlogit List] Nlogit ;pds

[Mahsa Taslimi]

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
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