2.
分类及回归树图形，首个划分位点为淋巴结分期，次级划分位点为厄洛替尼治疗线数，三级划分位点为吸烟状况
CART generated with the initial split on the outcome of the stage of lymph node, and then, on the time of administration of erlotinib, and on smoking status
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