Group of more or less equivalent .

Typically, in ecology, this equivalence is in terms of approximate age, such as for generating life tables along with survivorship curves.

Cohorts are also relevant to epidemiology as well as , where effort is made to control variables (controlled variables) by matching with those individuals that instead serve as negative controls.

This idea of a cohort being a group of equivalent individuals is also used explicitly to describe a conspecific.

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