nonlin5.sas

SAS for Windows统计分析系统教程,里面有源码

options nodate nonumber;
title 'Logistic Curve';
data nonlin5;
  k=77.0572;
  input x y @@;
cards;
11  1.62 13  3.33 15  6.45 17 28.50
19 41.32 21 63.10 25 74.27 27 76.97
;
proc nlin maxiter=200 method=dud;
  model y=k/(1+exp(a+b*x));
parms a=10 to 12 by 1 b=-0.6 to -0.5 by 0.1;
output out=a predicted=yp;
proc print;
run;