data logistic;
input dose y;
logdose=log(dose);
Datalines;
0.009 106.56
0.035 94.12
0.07 89.76
0.15 60.21
0.20 39.95
0.28 21.88
0.50 7.46
;
proc nlin data=logistic bias hougaard nlinmeasures;
parameters alpha=100 beta=3 gamma=300;
delta=0;
Switch=1/(1+gamma*exp(beta*log(dose)));
model y=delta+(alpha-delta)*Switch;
Run;
这个程序为什么显示语法错误,求大神。。。