What is Selection Bias and How Does It Impact Studies?
Selection bias occurs when the participants selected for a study are not representative of the wider population. This can result from non-random sampling methods, loss to follow-up, or non-response. For example, if a study on the effects of a drug only includes participants who are already healthy, the findings may not be generalizable to those with underlying health conditions. To mitigate selection bias, researchers can use random sampling techniques and ensure high follow-up rates.
