Examlex
The number of social classes recognized as existing by social scientists is:
Longitudinal
A type of study or research design that follows the same subjects over a period of time to observe changes or developments.
Experimental
Pertaining to a method of inquiry in science and psychology involving controlled testing of variables to study effects or outcomes.
Retrospective
An approach or study that looks back at events or experiences from the past.
Cross-sectional
Pertains to research that involves analyzing data from a population, or a representative subset, at a specific point in time.
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