[Limdep Nlogit List] Parameter constrain

[Liren Zhou]

Dr. Greene,

Thank you so much for your quick and thorough explanation.

Leren

On Sun, Jul 11, 2010 at 11:36 PM, William Greene <wgreene at stern.nyu.edu>wrote:

> To fix a parameter in a utility function, put the value in
> square brackets before the "*" at its first occurrence. For
> the model below, "Time[.7]*TIME_HBO in the utility function
> for MD.  See the manual, page N11-19.
> /B. Greene
>
> ----- Original Message -----
> From: "Liren Zhou" <lirenlist at gmail.com>
> To: limdep at limdep.itls.usyd.edu.au
> Sent: Sunday, July 11, 2010 11:25:50 PM GMT -05:00 Colombia
> Subject: [Limdep Nlogit List] Parameter constrain
>
> Hello,
>
> I am trying to estimate a simple MNL model using following code. I need
> to constrain coefficients for some variables. For example, set the
> coefficient of travel time to 0.07. Can anybody tell me how it works?
>
> Thanks a lot in advance!
> Leren
>
>
> NLOGIT; LHS = P_HBO, CASENUM, P_INDEX
>
> ; CHOICES = AM, MD, PM, NT
>
> ; MODEL: U(AM) =Time*Time_HBO/
>
> U(MD) = MD_C + MD_SR3*MODE_SR3 + Time*TIME_HBO + MD_SIZE*HH_SIZE/
>
> U(PM) = PM_C + PM_SR3*MODE_SR3 + Time*TIME_HBO + PM1_SIZE*HH_SIZE/
>
> U(NT) = NT_C + NT_SR3*MODE_SR3 + Time*Time_HBO + NT_SIZE*HH_SIZE$
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