Which among the following is NOT a type of longitudinal research?

ACross-sectional study ✓ Correct

BTrend study

CProspective study

DCohort study

Correct answer: (A) Cross-sectional study

Explanation

A cross-sectional study is not a form of longitudinal research.

It collects data at a single point rather than over repeated time periods.

Trend studies repeatedly sample a population across time, so they are longitudinal.

Prospective studies follow participants forward, making them longitudinal.

Cohort studies track a defined group over time and are longitudinal.

Longitudinal designs need at least two waves of measurement over time.

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