Course: Collider Bias
CME Credits: 1.00
Released: 2022-03-14
Bias is a systematic, nonrandom error in the estimation of a treatment effect or the effect of an exposure or risk factor. Bias can lead to invalid results in observational studies and randomized clinical trials (RCTs). Bias is often broadly categorized into 3 groups: confounding, information (or measurement) bias, and selection bias., Selection bias is a general term describing bias that occurs when study participants are identified in a manner such that they are no longer representative of the target population. This can occur when an exposure and outcome each influence a common third variable—the collider—and that variable has been controlled for in the statistical analysis of the study data. Collider bias threatens the internal validity of a study and the accurate estimation of causal relationships.
Educational Objective
To identify the key insights or developments described in this article
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