Endogenous Selection Bias: The Problem of Conditioning on a Collider Variable [pdf](ssc.wisc.edu)
ssc.wisc.edu
Endogenous Selection Bias: The Problem of Conditioning on a Collider Variable [pdf]
https://www.ssc.wisc.edu/soc/faculty/pages/docs/elwert/Elwert%20Winship%202014.pdf
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