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A longitudinal study observes the same subjects, usually human beings, over a long period of time, usually to detect onset of disease.
A longitudinal study observes the same subjects, usually human beings, over a long period of time, usually to detect onset of disease.
A longitudinal study differs in approach from a [[cross-sectional study]] and a [[retrospective study]].
A longitudinal study differs in approach from a [[cross-sectional study]], which looks at something at a particular moment or snapshot in time.
A [[retrospective study]] is a less desirable type of longitudinal study that looks backwards rather than forwards in time.