刚才在做逻辑回归模型试验的时候出现了一点小小的warning，不过还是输出了结果，写的代码如下：


SAS日志如下：

NOTE: PROC LOGISTIC is modeling the probability that zd_1=1.
NOTE: Convergence criterion (GCONV=1E-8) satisfied in Step 0.
WARNING: There is a complete separation of data points in Step 1. The maximum likelihood estimate does not exist.
WARNING: The LOGISTIC procedure continues in spite of the above warning. Results shown are based on the last maximum likelihood iteration. Validity of the model fit is questionable.

感觉好像是模型的有效性出了问题。。。能否帮忙解答一下问题到底出在哪里了？