Heckman的意思|示意

Heckman , J . J . ( 1979 ), Sample selection bias as a specification error , Econometrica, 47, 153 - 161.

样本选择偏差, 一看就知道是个很重要的问题嘛, 排名第五, 不算亏待.

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Carey Heckman teaches in the philosophy and computer science departments at Dartmouth.

CareyHeckman在Dartmouth大学的哲学系和计算机科学系任教.

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Critic Don Heckman was there when the song ended.

演唱结束时评论家唐?赫克曼在现场.

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