Which design follows participants over time to assess changes?

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Multiple Choice

Which design follows participants over time to assess changes?

Tracking the same people across multiple time points to see how outcomes change is the essence of a longitudinal design. By repeatedly measuring the same participants, researchers can map trajectories, determine the order of changes, and distinguish true within-person change from differences between individuals. This is different from a cross-sectional approach, which captures data at only one moment and can’t show how things evolve over time. A case-control approach looks backward, comparing people with and without a condition to identify past differences, rather than following change over time. An experimental design with randomization tests interventions and causality, but the defining feature here is the continuous follow-up of the same participants to observe how things shift, which is why longitudinal design is the best fit.

Tracking the same people across multiple time points to see how outcomes change is the essence of a longitudinal design. By repeatedly measuring the same participants, researchers can map trajectories, determine the order of changes, and distinguish true within-person change from differences between individuals. This is different from a cross-sectional approach, which captures data at only one moment and can’t show how things evolve over time. A case-control approach looks backward, comparing people with and without a condition to identify past differences, rather than following change over time. An experimental design with randomization tests interventions and causality, but the defining feature here is the continuous follow-up of the same participants to observe how things shift, which is why longitudinal design is the best fit.

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