Illustrating bias due to conditioning on a collider

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ID: 305269
2009
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Abstract
That conditioning on a common effect of exposure and outcome may cause selection, or collider-stratification, bias is not intuitive. We provide two hypothetical examples to convey concepts underlying bias due to conditioning on a collider. In the first example, fever is a common effect of influenza and consumption of a tainted egg-salad sandwich. In the second example, case-status is a common effect of a genotype and an environmental factor. In both examples, conditioning on the common effect imparts an association between two otherwise independent variables; we call this selection bias.
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openalex_W2127992265 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Stephen R. Cole, Robert W. Platt, Enrique F. Schisterman, Haitao Chu, Daniel Westreich, David J. Richardson, Charles Poole
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Journal International Journal of Epidemiology
Year 2009
DOI
10.1093/ije/dyp334
URL
https://doi.org/10.1093/ije/dyp334
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