Watch A tour of power and sample size.

Watch New power and sample-size features.

 

Classic comparisons

Means (t-tests)

Proportions

Variances

Correlations

McNemar’s test

Clustered data

 

ANOVA

One-way models

Two-way models

Repeated-measures models

 

Linear regression 

Slope test

Coefficient-of-determination test

Partial-correlation test

Watch Power analysis for cluster randomized designs and linear regression.

 

Contingency tables

Cochran—Mantel—Haenszel test

Matched case—control studies

Cochran—Armitage trend test

 

Cluster randomized designs 

One-sample mean

Two-sample means

One-sample proportion

Two-sample proportions

Log-rank test

Watch Power analysis for cluster randomized designs and linear regression.

 

Survival analysis

Log-rank test of survival functions

Cox proportional hazards model

Exponential regression

Clustered Data

 

Solve for

Power

Sample size

Number of clusters

Cluster 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

Watch Power and sample size tutorials