Observational Studies

Observational Studies

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Observational studies differ from experiments in that the investigator cannot control the assignment of treatment to subjects. This text discusses nonadditive models, and the planning and coherence of studies.In an experiment, the assignment of treatments to subjects is controlled by the experimenter, who ensures that subjects ... They gave vitamin C to 100 patients believed to be terminally ill from advanced cancer and studied subsequent survival. For each such patient, 10 historical controls were selected of the same age and gender, the same site of primary cancer, and the same histological tumor type.

Title:Observational Studies
Author: Paul R. Rosenbaum
Publisher:Springer Science & Business Media - 2002-01-08

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