Longitudinal research design is a research method where data is collected over an extended period, typically years or decades, to track changes and patterns in a particular variable or group of variables. It is often used in studies that examine development, aging, or changes in behavior over time. The data collected can be qualitative or quantitative and is usually gathered through surveys, questionnaires, interviews, or observations at different time points. Longitudinal research provides researchers with a more comprehensive and accurate understanding of the changes and trends in a particular phenomenon over time.
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