• Entry
  • Reader's guide
  • Entries A-Z
  • Subject index

Bias in Epidemiologic Studies

Epidemiologic research yields an estimate of an association or an effect. This estimate is obtained from a sample representing the population. While the true values in the population are not known, it is assumed that the estimated values are similar to them. The bias, the unknown deviation from the true value, determines the internal validity of a conclusion. The source of potential bias or confounding is sometimes obvious but more commonly unknown. In practice, researchers are expected to avoid known sources of bias in the design, control for potential bias in the analysis, and replicate their results to increase the internal validity of their studies.

Bias

Most epidemiologic studies, especially those using genetic markers, are association studies. Researchers must discuss such threats to internal validity of ...

    • Loading...
    locked icon

    Sign in to access this content

    Get a 30 day FREE TRIAL

    • Watch videos from a variety of sources bringing classroom topics to life
    • Read modern, diverse business cases
    • Explore hundreds of books and reference titles