Statistics notebook: entry II.B: Observational study, (1) retrospective study, and (2) prospective study.
de Land
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PN
Department of Mathematics, California State University, Fullerton 92634.
Chase
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WW
D006801:Humans; D011446:Prospective Studies; D012107:Research Design / Q000706:statistics & numerical data*; D012189:Retrospective Studies