Quantification of collider-stratification bias and the birthweight paradox. – PubMed – NCBI
https://www.ncbi.nlm.nih.gov/pubmed/19689488
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Recently, causal diagrams have been used to illustrate the possibility for collider-stratification bias in models adjusting for birthweight. When two variables share a common effect, stratification on the variable representing that effect induces a statistical relation between otherwise independent factors.
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