HS 267 Test Prep 41207

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
• Pearsons correlation coefficient (r) and test of
  H0 ? 0
• Least squares regression model including test of
  H0 ß 0, and confidence interval for ß
• 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
• Fishers and mid-P exact test
• Confounding (stratified tables)