Data collected at two or more points in time are

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The data collected at two or more points in time indicates a longitudinal research design, where the same individuals or groups are observed over an extended period. This design allows researchers to track changes and examine the effects of time on study variables. Cross-sectional designs (A) collect data at a single point in time, whereas inefficient designs (B) and event-based designs (D) do not adequately capture changes in variables over time.

Data Collected at Two or More Points in Time Are