Date:         Tue, 4 Nov 2003 12:53:52 -0200
Reply-To:     Silvano Cesar da Costa <silvano@UEL.BR>
Sender:       "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From:         Silvano Cesar da Costa <silvano@UEL.BR>
Subject:      Nonlinear models -
Content-Type: text/plain; charset="iso-8859-1"

Hi folks,

I have four levels of DO - (Densidade Ótica) and 11 times (0 4 6 8 10 12 14 16 20 24 36). My responde was 
I fitted a logistic model with additive error, like below, but I'm not sure about compare the levels of DO. Are there diferences amog them?  How could I to do this??

Proc sort data=do;

by do;

Proc print noobs; run;

Proc nlin data=do;

parms b1 1.7464 b2 1 b3 1 ;

model Resp = b1/(1+b2*exp(-b3*times));

by do;

output out=sai p=pred r=residuo;

run;



symbol1 c=red v=dot;

symbol2 c=blue v=dot i=splines;

axis2 label=(a=90 'Residuo');

axis3 label=(a=90 'Densidade Otica');

Proc gplot data=sai;

plot Resp*tempo pred*tempo / overlay vaxis=axis3;

plot residuo*tempo / vref=0 vaxis=axis2;

by do;

run;

quit;



Thanks,

Silvano Cesar da Costa
Departamento de Matemática Aplicada
Centro de Ciências Exatas
Universidade Estadual de Londrina
Campus Universitário
Cx. Postal 6001
CEP 86051-990
Londrina - PR

Fone: (43) 3371 4346