POPM 3240 Study Guide - Quiz Guide: Net Present Value, Unimodality, Multimodal Distribution

• School: University of Guelph
• Department: Population Medicine
• Course: POPM 3240
• Professor: Cathy Bauman

Document Summary

Must distinguish between those with disease and those without disease to understand the disease and provide proper care. Tests must be able to accurately do this! Test: any critical examination, observation, or evaluation used to determine health and disease outcomes and potential exposures. Screening test: population approach on apparently healthy people to detect subclinical disease, provides early indication. Diagnostic test: used on sick people to confirm, classify, inform treatment, or provide prognosis for a particular disease. Bimodal distribution: has 2 peaks, allows clear separation of population (those with and those without disease) Unimodal distribution: most common, has 1 peak, must choose cutoff to separate people (not always easy!) Both distri(cid:271)utio(cid:374)s ha(cid:448)e a (cid:862)gray zo(cid:374)e(cid:863) i(cid:374) (cid:449)hi(cid:272)h people (cid:272)ould (cid:271)elo(cid:374)g to either group. Both allo(cid:449) (cid:272)lear separatio(cid:374) fro(cid:373) o(cid:448)erall (cid:862)(cid:374)or(cid:373)al(cid:863) fro(cid:373) (cid:862)a(cid:271)(cid:374)or(cid:373)al(cid:863) Validity: test"s a(cid:271)ility to disti(cid:374)guish those (cid:449)ho ha(cid:448)e disease fro(cid:373) those (cid:449)ho do(cid:374)"t. Sensitivity: ability of test to correctly identify those who have the disease.