Within the context of survey research, a wave refers to each separate survey in a series of related surveys. If a survey is conducted only once, then the concept of a "wave" does not apply. It is when a survey is conducted two or more times, for example, once a year for 5 years in a row, that each repeated survey is called a wave. These waves may represent a panel survey in which the same respondents are tracked over time, often being asked some or all of the same questions in each wave. Other multi-wave (longitudinal) surveys use independent samples at each wave.
When a panel study is conducted and respondents who are interviewed in a prior wave are not successfully interviewed in a subsequent ...
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