请教各位大吓:
SAS回归模型选项如:
MODEL Y=X1-X3 X11 X22 X33 /SELECTION=STEPWISE
MODEL Y=X1-X3 X11 X22 X33/SELECTION=FORWARD
在两模型,回归方法STEPWISE和FORWARD有什么区别????
楼主: 杨秋水
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[原创]关于SAS回归 |
硕士生 96%
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回帖推荐教科书上是这要说的:Forward: starts with the best single regressor, then finds the best one to add to what exists, then the next best, and go on.Stepwise: simlilar to FORWARD, excpet that there is an additional step where all variables in each equation are checked again to see if they remain significant after the new variable has been entered. 假设有 independent variables x1, x2, x3, forward 会依据 ...
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