Date:         Mon, 22 Jun 2009 16:10:47 -0700
Reply-To:     Shankar <shankar.stat@GMAIL.COM>
Sender:       "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From:         Shankar <shankar.stat@GMAIL.COM>
Organization: http://groups.google.com
Subject:      Re: SAS differential equations fitting problem
Comments: To: sas-l@uga.edu
Content-Type: text/plain; charset=ISO-8859-1

Is this glucose/insulin absorption model? what are X and l ?

I think you would need an initial/steady-state condition for X; For G
and l, you already have data at t= 0, so they can be used as initial
conditions;

at t=0, can you assume dG/dt = 0 ? i.e initially absorption rate is
0;

I suspect your model is incomplete, i,e. you might need another ODE
for l;

Thanks,
Shankar