看到许多含有Logistic Regression的Python包，但或多或少都缺少较全面的模型控制及结果检验参数，
造成实际工作中的许多不便。这一点无法跟R中的LRModel相比，更不说跟SPSS或SAS了。之前用R曾尝试写了几次，
实现部分函数或功能，不过最后都东流了...
终于下定决心，参照SAS Logistic Procedure。先用Python来实现其中的Stepwise过程(剩下的Forward和Backward就简单了)。
stepwise.ipynb就是通过一个实例测试其中的StepwiseModel。测试数据来自于SAS中的logistic模块，参照：
http://support.sas.com/documentation/cdl/en/statug/63962/HTML/default/viewer.htm#statug_logistic_sect059.htm
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