The same people are tested and retested over a period of years in a(n)

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A longitudinal study is a research method that involves testing and retesting the same individuals over a period of time, usually years or even decades. This allows researchers to track changes and development within the same group of people, and to identify patterns and trends that may not be apparent in shorter-term studies or studies that involve different groups of people. Factors analysis is a statistical technique used to explore relationships between variables, genetic assessment is a study of an individual's DNA to determine the presence or absence of specific genetic markers, and cross-sectional studies involve testing different groups of people at the same time rather than following the same individuals over time.

The Same People Are Tested and Retested Over a Period