Date:         Fri, 25 Aug 2006 09:55:09 +0200
Reply-To:     Spousta Jan <JSpousta@CSAS.CZ>
Sender:       "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From:         Spousta Jan <JSpousta@CSAS.CZ>
Subject:      Re: (C)NLR with log-likelihood loss function
Comments: To: Gary Rosin <grosin@stcl.edu>
Content-Type: text/plain; charset="us-ascii"

Hi Gary,

If I am not mistaken, this is just what is LOGISTIC REGRESSION command
for. Why not to try it instead of torturing nonlinear regression?

LOGISTIC REGRESSION y
  /METHOD = ENTER x1 x2 .

Greetings

Jan

-----Original Message-----
From: SPSSX(r) Discussion [mailto:SPSSX-L@LISTSERV.UGA.EDU] On Behalf Of
Gary Rosin
Sent: Friday, August 25, 2006 4:55 AM
To: SPSSX-L@LISTSERV.UGA.EDU
Subject: (C)NLR with log-likelihood loss function

I'm trying to use nonlinear regression to fit a regression using the
logit transformation (0<y<1):

         y = 1/(1+exp(-(b0+b1*x1+b2*x2)))

I'm using SPSS 14.0.2, and need a macro/syntax that will let me use
log-likelihood as the loss function.  The data is in the form of cases
with y(i), x1(i), and x2(i).

Any suggestions?

     ---
Prof. Gary S. Rosin                 grosin@stcl.edu
South Texas College of Law
1303 San Jacinto             Voice:  (713) 646-1854
Houston, TX  77002-7000    Fax:           646-1766