In which type of study are the same people tested and retested over a period of years?

Question

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In a longitudinal study, the same group of people are tested and retested over a period of years to observe changes and patterns in behavior or development. This is different from a cross-sectional study where different groups of people are compared at one point in time, and a correlational study which looks at the relationship between two variables without manipulating or testing them directly. A scatterplot is a graphical representation of correlational data.

In Which Type of Study Are the Same People Tested