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Power and sample size

Classic comparisons

  • Means (t-tests)
  • Proportions
  • Variances
  • Correlations
  • McNemar's test

ANOVA

  • One-way models
  • Two-way models
  • Repeated-measures models

Contingency tables New

  • Cochran—Mantel—Haenszel test
  • Matched case—control studies
  • Cochran—Armitage trend test

Survival analysis Updated

  • Log-rank test of survival functions
  • Cox proportional hazards model
  • Exponential regression

Solve for

  • Power
  • Sample size
  • Effect size (minimum detectable effect)

Designs

  • Matched case–control studies
  • Cohort studies
  • Cross-sectional studies
  • Balanced
  • Unbalanced

Specify lists of

  • Alpha values
  • Power levels
  • Beta values
  • Sample sizes
  • Ratios of sample sizes
  • And more

Multiple scenarios using

  • All combinations of values
  • Parallel lists of values

Control panel interface

  • Select analysis type from descriptive summaries
  • Specify list of power, sample size, or other levels
  • Automated tables and graphs
  • Customize tables and graphs
  • Command interface too (of course)

Tables

  • Automated
  • Customized

Graphs

  • Automated
  • Customized
  • Simple or comparative

Save results to dataset

Add your own methods

Additional resources


See New in Stata 14 for more about what was added in Stata 14.

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