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Retrospective cohort study. Case–control study versus cohort on a timeline. "OR" stands for "odds ratio" and "RR" stands for "relative risk". A retrospective cohort study, also called a historic cohort study, is a longitudinal cohort study used in medical and psychological research. A cohort of individuals that share a common exposure factor ...
A prospective cohort study is a longitudinal cohort study that follows over time a group of similar individuals ( cohorts) who differ with respect to certain factors under study, to determine how these factors affect rates of a certain outcome. [1] For example, one might follow a cohort of middle-aged truck drivers who vary in terms of smoking ...
A cohort study is a particular form of longitudinal study that samples a cohort (a group of people who share a defining characteristic, typically those who experienced a common event in a selected period, such as birth or graduation), performing a cross-section at intervals through time. It is a type of panel study where the individuals in the ...
The Millennium Cohort Study is an ongoing longitudinal cohort study headquartered at the Naval Health Research Center in San Diego, California and designed to evaluate any long-term health effects of military service, including deployments. [1] It is the largest population-based prospective health project in US military history, [2] [3] [4 ...
In probability theory, the coupon collector's problem refers to mathematical analysis of "collect all coupons and win" contests. It asks the following question: if each box of a given product (e.g., breakfast cereals) contains a coupon, and there are n different types of coupons, what is the probability that more than t boxes need to be bought ...
Case–control study versus cohort on a timeline. "OR" stands for "odds ratio" and "RR" stands for "relative risk". In statistics, epidemiology, marketing and demography, a cohort is a group of subjects who share a defining characteristic (typically subjects who experienced a common event in a selected time period, such as birth or graduation).