A type of systematic error (see “Systematic Error”) or bias (see “Bias, Systematic”) in research that arises when respondents who are selected to participate in a study fail to respond or do not answer all of the questions in a survey. For example, if people who earn higher household incomes are less likely to answer questions about how much they earn, then the results present a skewed picture of the overall sample’s income due to non-response bias.
