[R] nls

[Anne_Yeh@hc-sc.gc.ca]

Hello,

I want to convert the following SAS code in S-plus script.
I'm using S-Plus 2000 in Windows 95.

PROC nlmixed data=dat cov df=39;
 PARMS A=-1.5 A1=0.5 B=1.1 C=.1 D=.7;
 IF SAMPLE="s" THEN I=0;
 ELSE I=1;
 Y=A+B*lconc + A1*I;
 F1=C+(D-C)/(1+EXP(-Y));
 MODEL OD ~ normal(F1,s2e);

Does anyone have any advice as to how to do this?

Any comments will be appreciated,

Anne


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