Video - Selection bias

Selection bias refers to a systematic error that occurs when the sample of individuals being studied is not representative of the population of interest. This can lead to incorrect conclusions and invalid results from those research studies. Several types of selection biases include sampling bias, non-response bias, and Berkson's bias.

Sampling bias occurs when the sample of individuals being studied does not cover or represent the population of interest. In non-response bias, some individuals in a study do not respond to a survey or questionnaire, leading to incorrect conclusions and invalid results. Finally, Berkson's bias occurs when individuals in both case and control groups are recruited based on a characteristic that's associated with the exposure.