[Limdep Nlogit List] Nlogit ;pds

William Greene wgreene at stern.nyu.edu
Fri Dec 20 04:57:18 AEDT 2019

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 =
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
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
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