Longitudinal Data Explained Key Benefits Applications Comparisons

1592 reads · Last updated: January 15, 2026

Longitudinal data track the same sample at different points in time, distinct from repeated cross-sectional data, which involve conducting the same survey on different samples at different points in time. Longitudinal data have many advantages over repeated cross-sectional data. They allow for the measurement of within-sample changes over time, enable the measurement of the duration of events, and record the timing of various events.

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