Did Brad Tell Jen About The Baby And Bringing Home Ir New Idea

在传统 did 模型中，所有单位的政策时间一致，安慰剂检验只需在所有单位中随机抽取固定数量的若干单位作为实验组便可。但是，在多期 did 中每个单位的政策时间不同，该种方法便不再.

Brad Pitt and Jennifer Aniston Baby Alert? The Hollywood Gossip

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