For other senses of this word, see cohort (disambiguation). In statistics and demography, a cohort is a group of individuals together as a specific event during a certain period of time  divided (for example, in Europe between 1918 and 1939 born individuals; the survivors of a plane crash, a truck driver, who, between 30 and 40 years old, smoked). Cohorts for long periods in an epidemiological study. The cohort is editable by the censors, d. h. without certain individuals from statistical calculations for periods of time (e.g. after death) If your data pollute you the results. The cohort of the term may also be used, which is defined as belonging to a group by a factor as a function of time: for example, a study in many workers of the building, a cohort is the people who work in a building in particular. Demography often contrasts with the perspective of period and cohort of Outlook. For example, the total cohort fertility rate is an index of labour who have completed the whole medium family for the cohorts of women, but how it can be known only by women, not for currently fertile women can be measured. miracle pregnancy at 40 It can be as the sum of the age specific fertility rates calculated for the cohort of aging over time. On the other hand, uses current period of fertility of the age of full size fertility family for a fictitious woman was calculated to meet these fertility rates through her life. See also  StatisticsCohort Office StudyGenerational job CohortsNational LW SurveysReferences  ^ BLS information. Glossary. Information services Labour Statistics Division. February 28, 2008 it had recovered 05/05/2009. ↑ Dodge, y. (2003) Oxford Dictionary of statistics, Oxford University Press. ISBN 0-19-920613-9External edited cohort  links to the glossary, division of Labour Office statistics information we ServicesCentre to resource center of the United Kingdom national birth cohort longitudinal studies. . . . . .