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What is a cohort? How is it used for preparing survivorship curves?
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A cohort is a group of subjects who share a defining characteristic. Cohort data can oftentimes be more advantageous to demographers than period data.
survivorship curve is a graph showing the number or proportion of individuals surviving to each age for a given species or group (e.g. males or females). Survivorship curves can be constructed for a given cohort (a group of individuals of roughly the same age) based on a life table.
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