[Limdep Nlogit List] simulation command in NLOGIT

William Greene wgreene at stern.nyu.edu
Sun Jan 17 05:48:04 AEDT 2021

The market shares are computed by summing the predicted probabilities
and dividing the sums by the number of choice tasks used to compute the
sums.  For an RPL model, the probabilities are computed using the
simulation on which the model is based.  It would probably be much too
complicated to replicate this with CREATE. That is why the ;Simulate option
is provided.
/B. Greene

On Thu, Jan 14, 2021 at 6:59 PM Jason Ong via Limdep <
limdep at mailman.sydney.edu.au> wrote:

> hi,
> How does the ;simulation command in NLOGIT estimate the "market shares" (I
> couldn't find the details in the Applied Choice Analysis text book)
> is it possible to also do a manual calculation using beta coefficients from
> an RPL model?
> For example, I have an unlabelled DCE with 3 alternative
> Alternatives A and B are unlabelled and Alternative C is an opt-out option
> I ran an RPL model and used the simulation command in NLOGIT to see the
> change in % of people choosing the opt-out option (alternative C) when I
> altered one attribute level at a time
> This worked for all my attributes in the model except for one (it returned
> unusually high values which did not correspond with the patterns I am
> seeing from the beta coefficients)
> so I was wanting to see if it is possible to use a manual calculation to
> check the output from the simulation?
> thanks for your help.
> Let me know if I need to explain further
> Best,
> *Jason Ong*
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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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Email: wgreene at stern.nyu.edu
Editor in Chief: Journal of Productivity Analysis
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