我用nlmixed处理logit函数，<br/>proc nlmixed data=sas.Nlmixed_panal ITDETAILS;<br/>      parms a=-2 b=2 c=-1 d=-1 e=-1 f=1 s2u=0.0001; <br/>     eta=a+b*DA_Jones_GA+c*LnFee+d*mindex+e*Dtop+f*R_reputation1+u;<br/>     expeta=exp(eta);<br/>     p=expeta/(1+expeta);<br/>     BOUNDS 0<=s2u;<br/>     MODEL nop ~ BINOMIAL(n,p);<br/>     RANDOM u ~ NORMAL(0,s2u) SUBJECT=code;/*code是重复变量，共重复了4次*/<br/>     predict eta out=eta;<br/>    replicate repeat;<br/>RUN;<br/>运行后报错： Quadrature accuracy of 0.000100 could not be achieved with 31 points.  The achieved accuracy was 1.000000.<br/>迭代过程NOTE: Indeterminate likelihood encountered for observation 9 during iteration -1<br/>是什么原因呢<br/>