Look at what james did, all those middle school drama. Did 和事件研究法等确实有别，但是为了方便而且也不歧义，下面就只说 did 了。 这当然是极好的，did 方法从获得诺贝尔经济学奖到本科生都能应用的时间并不长。这点也和工具变量法当年的情形类似，. 真的很多人把精神分裂和人格分裂搞混，但二者实际上很大差别。精神分裂症英文名叫 schizophrenia ，俗称的人格分裂症或者说分离性身份识别障碍的英文全称 dissociative identity disorder（did），.
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双重差分法作为一种计量模型，其本身不解决内生性问题，双重差分法解决内生性问题，本质上仍然依赖于干预或政策冲击本身的外生性。 标准 did（standard did） 双重差分的核心是通过构造交互项来.
So it's not hard to understand why this man was enraged and feigned strength after losing face.
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