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HS 267 Test Prep (4/12/07)

HS 267 Test Prep (4/12/07). Exam 4/19 40 – 50 questions 1.5 hours long. Bring to test. Formula sheets with tables Part 1 -- Quantitative outcomes (new p. 5 distributed last week) Part 2 -- Categorical outcomes (distributed last week) Packets include t , F , and X 2 tables

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HS 267 Test Prep (4/12/07)

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  1. HS 267 Test Prep (4/12/07) Exam 4/19 40 – 50 questions 1.5 hours long

  2. Bring to test • Formula sheets with tables • Part 1 -- Quantitative outcomes (new p. 5 distributed last week) • Part 2 -- Categorical outcomes (distributed last week) • Packets include t, F, and X2 tables • Calculator • Pencils with good erasers • Small blue book

  3. Topics • Correlation and regression • Cross-tabs • Relative risk (including confounding and stratified tables)

  4. Correlation & Regression • Scatterplot • Pearson’s correlation coefficient (r) and test of H0: ρ = 0 • Least squares regression model including test of H0: β = 0, and confidence interval for β • Necessary conditions (L.I.N.E.) • Transforms (to straighten relations)

  5. Cross-Tabulated Counts • Types of samples (naturalistic, cohort, case-control) • R-by-C table • Marginal distributions • Conditional distributions (relationships) • X2 test of association

  6. Relative Risks • 2-by-2 table • Incidences and prevalence • RR estimate and confidence interval • Fisher’s and mid-P exact test • Confounding (stratified tables)

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