what is a cohort research study
Cohort Study is an observational study in which a group of individuals – a cohort – 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.
A longitudinal survey is a correlational research study that involves repeated observations of the same variables over long periods of time — often many decades.It is a type of observational study.Longitudinal studies are often used in psychology to study developmental trends across the life span, and in sociology to study life events throughout lifetimes or generations.ohort studies sample a cohort, defined as a group experiencing some event (typically birth) in a selected time period, and studying them at intervals through time. Panel studies sample a cross-section, and survey it at (usually regular) intervals. A retrospective study is a longitudinal study that looks back in time.