Cross-sectional design refers to a research design using a large sample of the population of various ages at one time for testing purposes in contrast with Longitudinal design; a research design that compares different groups of individuals or subjects from different age groups are studied at at the same point in time. Cross-sectional design is also defined as a methodology to examine a characteristic by comparing individuals of different ages
Other /More definition:
- cross-sectional design : cross-sectional design refers to methodology to examine a characteristic by comparing individuals of different ages . This design is in contrast with Longitudinal design.

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