longitudinal design

the study of a variable or group of variables in the same cases or participants over a period of time, sometimes several years. An example of a longitudinal design is a multiyear comparative study of the same children in an urban and a suburban school to record their cognitive development in depth. A longitudinal study that evaluates a group of randomly chosen individuals is referred to as a panel study, whereas a longitudinal study that evaluates a group of individuals possessing some common characteristic (usually age) is referred to as a cohort study. Also called longitudinal research; longitudinal study. Compare cross-sectional design.

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Psychology term of the day

May 8th 2024

peptide

n. a short chain of amino acids linked by peptide bonds. Peptides are usually identified by the number of amino acids in the chain. For example, dipeptides have two amino acids, tripeptides three, tetrapeptides four, and so on. See also polypeptide; protein.