https://mp.weixin.qq.com/s?__biz=MzI1MjQ2OTQ3Ng==&mid=2247581343&idx=1&sn=3d6d431233b5d385413adba686881d8e&chksm=e9e0b714de973e022d7ce5978a6c339ef8f786a6987779fe353d62ae3f13a008a73eadd42099&scene=27 1.前4章内容 2.问题解释 2.1.为什么在因果推断中该公式不成立E[Y(1)] - E[Y(0)] = E[Y|T=1] - E[Y|T=0] ? 3.基础知识补充 期望与方差的主要性质