Cohort (statistics)

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Cohort (statistics)

Cohort (pronunciation: /ˈkoʊhɔːrt/) in statistics refers to a group of subjects who share a defining characteristic. We usually find cohorts in medical and social sciences, epidemiology, and ecology.

Etymology

The term "cohort" is derived from the Latin cohors, which means "enclosure". In ancient Rome, a cohort was a unit of soldiers. In statistics, the term is used to denote a group of subjects observed over time.

Definition

In statistics, a cohort is a group of individuals who share a common characteristic or experience within a defined period (e.g., are born, are exposed to a drug or vaccine, etc.). Cohorts can be more broadly defined for comparative purposes, as in a cohort study, where two or more groups of people (cohorts) are classified in terms of the presence or absence of exposure to a particular factor and followed to determine the incidence of an outcome.

Related Terms

  • Cohort Study: A type of observational study that follows a cohort over time to find out the effects of different variables.
  • Epidemiology: The study and analysis of the distribution, patterns and determinants of health and disease conditions in defined populations.
  • Ecology: The branch of biology that studies the interactions among organisms and their environment.
  • Observational Study: A type of study in which individuals are observed or certain outcomes are measured.

See Also

External links

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