Selection Bias - Analytic Study

Lead Author(s): Jeff Martin, MD

Unbiased Sampling in Analytic Studies

In an analytic study or case control study, we are looking for the association between exposures (or interventions in the case of experimental studies) and diseases.

Schematic of Unbiased Sampling


Biased Sampling in Analytic Studies

Here is the schematic of what selection bias might look like in an analytic study. (The arrows in the stick diagrams predict the direction of the bias.)

Schematic of Biased Sampling


See Also

Other causes of selection bias