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An observational study is retrospective if it considers only existing data. It is prospective if the study design calls for data to be collected as ti

Study design
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asked 2021-06-21
An observational study is retrospective if it considers only existing data. It is prospective if the study design calls for data to be collected as time goes on. Tell which of the following observational studies are retrospective and which are prospective. Paxton devises a complicated formula based on game statistics for rating quarterbacks. He applies it to all NFL quarterbacks who played in the league between 1950 and 2000 and concludes that the quarterbacks from the 1970s were the best overall.

Answers (1)

2021-06-22
Retrospective: data are collected from the past by going back in time Prospective: data are collected in the future
The sample collects data from 1950 and 2000.
This then implies that the data are collected in the past and thus the observational study is retrospective.
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