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Single Proportion

Basic sample size calculators

Odds Ratio

Calculate effect measures for research studies

Epidemic Curve

Visualize outbreak progression over time

By discipline

Sample Size - Basic3

Basic sample size calculators

Single ProportionDescriptive study for a single proportionTwo ProportionsCompare two independent proportionsTwo MeansCompare two independent means

Sample Size - Advanced3

Advanced study designs

Cohort StudiesSample size for cohort/prospective studiesCorrelation StudiesSample size to detect correlationsSurvival AnalysisTime-to-event and survival studies

Measures of Association6

Calculate effect measures for research studies

Odds RatioCase-control & cross-sectional studiesRelative RiskCohort studies & RCTsRisk Difference & NNTAbsolute risk reduction and NNT/NNHAttributable FractionAFe, PAF and public health impactAttack RateOutbreak investigation and food-borne illnessCFR & SARCase Fatality Rate and Secondary Attack Rate

Diagnostic & Analysis6

Diagnostic tests, ROC curves, and standardization

Age StandardizationCompare rates between populationsEpidemic CurveVisualize outbreak progression over timeSurvival AnalysisKaplan-Meier curves and Log-Rank testsTest AccuracySensitivity, Specificity, PPV, NPV, LRROC AnalysisROC curves and AUC sample sizePoisson RatesIncidence rates and rate comparisons

Statistical Tests7

Hypothesis testing and inference

T-TestsOne-sample, two-sample, paired t-testsNon-Parametric TestsMann-Whitney U, WilcoxonChi-Square TestsIndependence, goodness of fit, McNemarAgreement MeasuresKappa statistics and ICCOne-Way ANOVACompare means across multiple groupsTwo-Way ANOVACompare means with two factors & interactionNormality TestsShapiro-Wilk and D'Agostino's K2

Study Design & Resources2

Tools for designing and documenting research

RandomizationSimple, Block, and Stratified randomizationStats DictionarySearchable glossary of statistical terms

Regression & Correlation3

Analyze relationships between variables

CorrelationPearson's r and Spearman's rhoLinear RegressionSimple and Multiple Linear RegressionLogistic RegressionBinary and Multinomial Logistic Regression

Power Analysis1

Calculate statistical power for study planning

Unmatched Case-ControlPower for unmatched case-control studies

Built with precision for statistical analysis and research