selection bias

Selection bias occurs when the individuals included in a study or analysis are not representative of the larger population. This can happen if certain groups are systematically excluded or overrepresented, leading to skewed results. For example, if a survey about health habits only includes gym-goers, it may not accurately reflect the health behaviors of the general population. As a result, conclusions drawn from such data can be misleading, affecting decision-making or policy inappropriately. Addressing selection bias is crucial to ensure that findings are valid and generalizable to the wider context.