In which kind of study does an investigator repeatedly study the same group of people as they get older?

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Longitudinal studies involve repeatedly studying the same group of people over a period of time, typically as they get older. Cross-cultural studies compare different cultural groups, while cross-sectional studies examine different groups of people at one point in time. Factor analysis is a statistical technique used to identify underlying factors or patterns in data.

In Which Kind of Study Does an Investigator Repeatedly Study