[Limdep Nlogit List] Parameter constrain

[William Greene]

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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