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Cohort Study is an observational study in which a group of individuals â a cohort â are followed over a period of time in order to determine either the incidence rate of certain diseases or the risk factors that lead to those diseases. These studies can be either prospective or retrospective.
Secondary research is defined as an analysis and interpretation of primary research. This occurs when an author combines many primary research articles with the intent of saying something. Secondary research is useful when you need broad information on a topic.