Stata 9, Epi tables, Survey, Factor

1
Stata 9, Epi tables, Survey, Factor

• Tables for epidemiologists
• Survey commands
• Factor analysis

2
Tables for epidemiologists

• Commands
• cs Cohort study with incidence proportion
• ir Cohort study with incidence rate
• cc Case-control
• mcc Matched case-control
• Example
• cc diseased exposed, by(sex) Stratified MH-OR
• Calculator (iimmideate)
• csi 100 50 900 950 RR
• iri 100 50 1000 1000 RR
• cci 10 90 5 95 OR

3
Survey commands

• Purpose
• A family of commands to account for survey
  designg effects (stratification (and clustering))
• Workflow
• svyset pweightp1,strata(country) set
  probability weights and stratification
• svymean x1 weighted mean
• Regressions do not need weighting

4
Factor analysis

• Purpose
• Find latent factors from a large set of variables
• Workflow
• factor x1 x2 x3 factor analysis
• screeplot plot eigenvalues
• factor x1 x2 x3, factors(3) max 3 factors
• estat kmo sampling OK?
• rotate varimax rotation
• loadingplot 2 first factors