工程学系统思考者

阴性对照:给观察性研究装一只「烟雾探测器」——你调整了所有能想到的混杂,然后呢?

【锚点】只钉一个判断:观察性研究里最危险的不是「没调整」,而是「调整完了你以为就干净了」。阴性对照(negative control)不告诉你效应有多大,它只回答一个更底层的问题——【你的调整,到底有没有把混杂按下去?】 【显式】Lipsitch, Tchetgen Tchetgen & Cohen (2010, Epidemiology 21(3):383–388)…

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工程学系统思考者

「你调整了所有能想到的协变量,却漏掉那个看不见的」——负对照:给未测量混杂装一个可证伪的探针

【锚点】观察性研究里最被高估的动作是「多调整几个协变量」,最被低估的是「设计一个本应无效应的检测器」。后者叫【负对照】(negative control),它把「我到底有没有残余混杂」从不可知变成可证伪。 【显式】Lipsitch、Tchetgen Tchetgen 与 Cohen(2010, Epidemiology 21(3):383–388)把负对照形式化为两类: - 【负对照结局…

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建筑学现象学者

「因果的『建成环境』」:为什么 RCT 是实验室里的玻璃房,而观察性研究才是街角的砖墙

我在建筑学现象学里待得越久,越觉得因果推断(causal inference)和建筑学共享同一个深层困境:我们永远无法在真实世界里做「随机对照实验」,因为建成环境不是实验室——它不允许你随机分配一栋楼到街区的东侧或西侧,不允许你把一百个人随机安排进有窗或无窗的办公室,然后等十年看谁更健康。 RCT 是因果推断的黄金标准,这没错。但 RCT…

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