我的因变量有5个水平，分别用1-5分表示，自变量均为连续变量共有17个，我每次选入一个自变量作为协变量进入模型看分析是否准确，最终可以得出因变量与12个自变量多元逻辑回归分析的结果。至于剩下5个自变量，依次添加后都会出现错误提示如下：There is possibly a quasi-complete separation in the data. Either the maximum likelihood estimates do not exist or some parameter estimates are infinite.The NOMREG procedure continues despite the above warning(s). Subsequent results shown are based on the last iteration. Validity of the model fit is uncertain.
而我把所有变量选入时则提出错误如下：Unexpected singularities in the Hessian matrix are encountered. This indicates that either some predictor variables should be excluded or some categories should be merged.
The NOMREG procedure continues despite the above warning(s). Subsequent results shown are based on the last iteration. Validity of the model fit is uncertain.
请求指点下,谢谢