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HSA 4700 Assignment 1 Saray Cardenas May 16 2004Assignment 11 The Rules of Evidence regarding Causal Inference 11 The three rules of evidence supporting Causal Inference are 1 Covariation If A causes B then they should move together or covary For example if smoking causes lung cancer then one can expect to find higher incidences of cancer among the smoking population and fewer among the non-smoking population However covariation between two events doesnt necessarily cause a link between A and B 2 Cause Prior to Effect The second rule involves distinguishing covariation from causation In other words a cause should precede its effect Although one event can precede another it does not need to cause it Therefore it is very crucial for researchers
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