John Snow's investigation of the 1848 cholera epidemic in London is an example of which type of research study?

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John Snow's investigation of the 1848 cholera epidemic involved analyzing data from past events to understand the source and spread of the disease, making it a retrospective study. He did not manipulate variables or randomly assign participants, which rules out randomized clinical trials and quasi-experiments. His study was not cross-sectional, as it did not examine a population at a single point in time but rather investigated past occurrences.

John Snow's Investigation of the 1848 Cholera Epidemic in London