step-wise-model-selection
多元统计的作业
用于对线性回归模型进行单向逐步选择
可以从空模型开始，也可以从满模型开始
虽然不一定收敛到最优模型，但也许还有一点用途
注:源代码上传错误，以后有空改
Homework of multivariate statistics
Perform model selection in single direction
Can start from null model or full model
Although it may not converge to the best model, some usage still possibly exists.
PS:Wrong code uploaded. Will make up for this later