Retrospective cohort studies frequently determine whether exposure to risk and protective factors affects an outcome. These are longitudinal studies that use existing datasets to look back at …

Aug 14, 2025 · Researchers study the medical and lifestyle histories of the people in each group to learn what factors may be associated with the disease or condition. For example, one group …

Jul 31, 2023 · A retrospective study, sometimes called a historical cohort study, is a type of longitudinal study in which researchers look back to a certain point to analyze a particular …

Retrospective studies may need very large sample sizes for rare outcomes.

Feb 10, 2023 · Retrospective cohort studies use secondary research data, such as existing medical records or databases, to identify a group of people with an exposure or risk factor in …

May 18, 2025 · Explore retrospective study methods in AP Statistics, covering design, bias detection, data analysis, and practical examples.

After a brief discussion of the history of case–control and retrospective cohort studies, this entry discusses the use, advantages, and disadvantages of the retrospective study design.

Jul 2, 2025 · For instance, a retrospective study of network logs might reveal patterns of intrusion attempts that can be used to strengthen security protocols. Informed Decision-Making: Insights …

Here we provide 10 rules that serve as an end-to-end introduction to retrospective analyses of observational health care data. A running example of a COVID-19 study presents a practical …

Jan 2, 2026 · An introduction to the main features and uses of study designs popular and unique to medicine and the health sciences.