入院次晨白细胞计数位于分类和回归树第三层，也对预后产生有意义的影响。
White blood cell count on 2~ndmorning is also correlated with the prognosis, while it is at the third step.
决策树和决策树的组合，是解决分类问题和回归问题比较流行的一类算法。
Decision trees and their ensembles are popular methods for the machine learning tasks of classification and regression.
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