Definitions for "Longitudinal study"
A study that involves the repeated observation or examination of a set of subjects over time with respect to one or more study variables.
A developmental study in which the same person is tested at various ages.
a study that looks at changes (e.g., in a person or group of people) over a long period of time.
an effective way to trace a person's profile backward historically, as far as the handwriting trail exists
Keywords:  median, mode, mean
Mean, Median, Mode