Every test, and where to run it

Every test the calculator can size a study for, in one alphabetical list. The name opens the workspace with that test already selected; the arrow beside it says when the method applies and what it assumes, so you can choose from here rather than opening each form in turn.

137 tests.

Confidence IntervalsBland–Altman Limits of Agreement
Confidence IntervalsCategory Proportions (all at once)
Confidence IntervalsChange over Time (repeated measures)
Confidence IntervalsChange over Time, Binary (GEE)
Confidence IntervalsCohen's Kappa (two raters, a yes/no rating)
Confidence IntervalsCorrelation
Confidence IntervalsCronbach's Alpha (internal consistency)
Confidence IntervalsDiagnostic AUC (ROC area)
Confidence IntervalsDiagnostic Likelihood Ratios
Confidence IntervalsDiagnostic Sensitivity & Specificity
Confidence IntervalsDifference Between Two Means
Confidence IntervalsDifference Between Two Proportions
Confidence IntervalsEvent Rate (Poisson or negative binomial)
Confidence IntervalsHazard Ratio (Cox)
Confidence IntervalsHazard Ratio per SD (Cox)
Confidence IntervalsHazard Ratio per Step (ordered groups)
Confidence IntervalsIntraclass Correlation (reliability)
Confidence IntervalsMedian Survival Time
Confidence IntervalsOdds Ratio
Confidence IntervalsOdds Ratio per SD (logistic or ordinal)
Confidence IntervalsOdds Ratios per SD (nominal outcome)
Confidence IntervalsOne Mean
Confidence IntervalsOne Median
Confidence IntervalsOne Proportion
Confidence IntervalsPaired Mean Difference
Confidence IntervalsPaired Odds Ratio (McNemar)
Confidence IntervalsProportional-Odds Odds Ratio (ordinal outcome)
Confidence IntervalsRate Difference
Confidence IntervalsRate Ratio
Confidence IntervalsRate Ratio per SD (Poisson or negative binomial regression)
Confidence IntervalsRegression Slope
Confidence IntervalsRelative Risk
Confidence IntervalsRisk Ratio per SD (modified Poisson)
Confidence IntervalsStratified survey (mean, proportion, median, paired or categories)
Confidence IntervalsSurvival at a Fixed Time (Kaplan–Meier)
CorrelationCompare Two Correlations
CorrelationPearson Correlation
CorrelationSpearman Rank Correlation
Crossover
Event ratesNon-inferiority of a Rate Ratio
Event ratesOne Rate vs a Known Rate
Event ratesRate Difference (Poisson)
Event ratesRate Ratio (negative binomial)
Event ratesRate Ratio (Poisson)
Event ratesRate Ratio (quasi-Poisson, over-dispersed)
Event ratesRates Across Three or More Groups
Event ratesTrend in Rates Across Ordered Groups
Interim analysesO’Brien-Fleming
Interim analysesPocock
MeansMultiple Arms vs One Control
MeansOne-Sample t-Test
MeansOne-Way ANOVA
MeansPaired t-Test
MeansRepeated Measures ANOVA (Approximation)
MeansTwo-Sample t-Test (Independent)
MeansWelch's t-Test (unequal variances)
MeasurementBland–Altman Limits of Agreement within a Tolerance
MeasurementCohen's Kappa against a Benchmark (two raters, yes/no)
MeasurementCronbach's Alpha against a Benchmark (Feldt)
MeasurementFactor Model Fit by RMSEA (MacCallum)
MeasurementIntraclass Correlation against a Benchmark
Non-InferiorityEquivalence (Means)
Non-InferiorityEquivalence (Proportions)
Non-InferiorityNon-Inferiority (Means)
Non-InferiorityNon-Inferiority (Proportions)
Odds RatioCommon odds ratio across strata (Cochran–Mantel–Haenszel)
Odds RatioOdds ratio between cases and controls
Power Calculator2×2 Crossover Trial
Power CalculatorAverage Level over Time
Power CalculatorChi-Square Test
Power CalculatorCommon odds ratio across strata (Cochran–Mantel–Haenszel)
Power CalculatorCorrelation
Power CalculatorCox Regression
Power CalculatorLinear Regression (R²)
Power CalculatorLog-Rank Test (Freedman)
Power CalculatorLog-Rank Test (Schoenfeld)
Power CalculatorLogistic Regression, Binary Predictor
Power CalculatorLogistic Regression, Numerical Predictor
Power CalculatorMann–Whitney Test
Power CalculatorMcNemar Test (paired proportions)
Power CalculatorOdds Ratio (case-control)
Power CalculatorOne Rate vs Reference
Power CalculatorOne-Sample Mean
Power CalculatorOne-Sample Proportion
Power CalculatorOne-Way ANOVA
Power CalculatorPaired Means
Power CalculatorRate Difference (Poisson)
Power CalculatorRate Ratio (Poisson)
Power CalculatorRate Ratio, Negative Binomial
Power CalculatorRate Ratio, Quasi-Poisson
Power CalculatorRates of Change (Slopes)
Power CalculatorRelative Risk (cohort)
Power CalculatorRepeated-Measures ANOVA
Power CalculatorSign Test
Power CalculatorStepped Wedge, Means
Power CalculatorStepped Wedge, Proportions
Power CalculatorTwo-Sample Means
Power CalculatorTwo-Sample Proportions
Power CalculatorWelch's t-Test
Power CalculatorWilcoxon Signed-Rank Test
ProportionsChi-square Goodness-of-Fit
ProportionsChi-square Test (2 × 2)
ProportionsChi-square Test of Independence (r × c)
ProportionsCochran–Armitage Test for Trend
ProportionsDiagnostic Accuracy Above a Minimum (exact)
ProportionsExact Binomial Test (one proportion)
ProportionsMcNemar's Test
ProportionsMultiple Arms vs One Control
ProportionsOne-Sample Proportion
ProportionsTwo-Sample Proportions
Rank testsJonckheere–Terpstra Trend Test (ordinal outcome, ordered groups)
Rank testsKruskal–Wallis Test (ordinal outcome, 3+ groups)
Rank testsMann–Whitney U / Wilcoxon Rank-Sum
Rank testsSign Test (one-sample or paired)
Rank testsWilcoxon Signed-Rank (paired)
RegressionCount (Poisson / Negative Binomial)
RegressionLinear Regression
RegressionLogistic Regression
RegressionLogistic Regression, Numerical Predictor
RegressionMultinomial Logistic
RegressionSingle Regression Coefficient
Relative Risk
Repeated measuresAverage level across follow-up
Repeated measuresChange in a binary outcome over time (one group, GEE)
Repeated measuresRates of change (slopes)
Stepped wedgeBinary
Stepped wedgeContinuous
SurvivalCox Proportional Hazards
SurvivalCox Regression, Numerical Predictor
SurvivalLog-Rank Non-Inferiority
SurvivalLog-Rank Test
SurvivalLog-Rank Test (Freedman's method)
SurvivalLog-Rank Test for Trend
SurvivalLog-Rank Test with a Delayed Effect
SurvivalOne-Sample Log-Rank Test
SurvivalRestricted Mean Survival Time (RMST) Difference
SurvivalSurvival Across Three or More Groups