[Limdep Nlogit List] Help for a Limdep neophyte

William Greene wgreene at stern.nyu.edu
Sun Sep 16 23:44:58 EST 2007

Mr. Edwards.  For the second logit model, you have to figure out what you
want to do with the other variables in the model - where to fix them - so
this applies to the first. If you want to plot it as a function of
BID, you should first find out what range to be plotting over. You might
do this:
BLOGIT ; LHS = YPAY ; RHS = one,bid $
CALC ; LowBid = Min(bid) ; HighBid = Max(bid) ; MedBid = Med(bid) 
     ; b1 = b(1) ; b2 = b(2) $
SAMPLE ; 1 $
FPLOT ; labels = Bids
      ; Limits=LowBid,HighBid
      ; Start  = MedBid
      ; Plot (Bids)
      ; Pts = 200
      ; Fcn = 1/(1+exp(b1 - b2*bids)) $
SAMPLE ; All $
This will plot the function values for the values in the range of
bids.  That said, I took your word for it that that was the function you
wanted, but it doesn't look right to me.  You have the wrong sign on
b2 in there.
/Bill Greene

----- Original Message -----
From: "Peter Edwards" <pedwards at UDel.Edu>
To: limdep at limdep.itls.usyd.edu.au
Sent: Saturday, September 15, 2007 1:35:25 PM (GMT-0500) Auto-Detected
Subject: [Limdep Nlogit List] Help for a Limdep neophyte


I am NLOGIT newbie who is stumbling thru trying to figure out stuff.

I am analysing a set of Dichotomous choice data.   I have calculated WTP 
estmates etc.  Now I am trying to understand how to display some of the 
descriptive statistics. Also I am trying to figure out how to plot the PDF 
and CDF based on my estimation results.

for example from the basic estimation(s) below, how do I plot the Prob 
density function?


I tried the following...but it is wrong....

FPLOT ; labels=(ypay)






I have been stumbling through the manuals but I have not been be able to get 
it right.


Peter E.T. Edwards
PhD. Candidate
Graduate College of Marine Studies
Room 312 Robinson Hall
Newark, DE 19716

Limdep site list
Limdep at limdep.itls.usyd.edu.au

Professor William Greene
Department of Economics
Stern School of Business
New York University
44 West 4th St., Rm. 7-78
New York, NY   10012

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