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Did, psm 及 did+psm 有何差异? did 要假定不可观测效应随时间变化趋势相同? @慧航 显示全部 ...
Kisd offers its students the possibility to explore and create the diversity and complexity of design in a profound and ...
Myupmc is a secure and convenient way to access your upmc health information online. The upmc central pa portal connects ...
本文介绍的是事件研究法 (event study) 在 stata 中的实现命令 eventdd,该命令由 damian clarke 和 ka ...
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