The Framingham Study and the two lung cancer studies are examples of retrospective cohort studies which followed large numbers of people over extended periods of time.

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The Framingham Study is an example of a prospective cohort study, not retrospective. It began in 1948 and has followed a large group of participants forward in time from the start of the study to observe outcomes, such as heart disease, as they occur.

The Framingham Study and the Two Lung Cancer Studies Are