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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. 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），. Did通常指解离性身份识别障碍（dissociative identity disorder），过去也被称为多重人格障碍，以下是关于它的详细介绍： 定义 解离性身份识别障碍是一种精神心理疾病，患者身上显示.
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