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  • In statistics and demography, a cohort is a group of subjects who have shared a particular event together during a particular time span (e.g., people born in Europe between 1918 and 1939; survivors of an aircrash; truck drivers who smoked between age 30 and 40). Cohorts may be tracked over extended periods in a cohort study. 


    A cohort study is a form of longitudinal study (a type of observational study) used in medicine, social science, actuarial science, business analytics, and ecology. Cohort studies are largely about the life histories of segments of populations, and the individual people who constitute these segments.

    March 2, 2015