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Statistics calculators

Statistics for laboratory data, built so that a result is never just a number. Every test page states its method, its assumptions, the sample size, the degrees of freedom, the test statistic and the p-value, with a confidence interval and an effect size wherever they apply.

The p-value is explained on each page for what it is, the probability of a result at least this extreme if the null hypothesis and the test's assumptions were true, and never as proof of an effect or of its absence. None of these tools labels a result as "significant" or "not significant". They cover descriptive statistics, confidence intervals, t-tests, ANOVA, chi-square and Fisher's exact test, correlation and regression, effect sizes, ROC curves and Bland-Altman agreement.

Descriptive Statistics CalculatorMean, median, mode, variance, SD, SE, CV, quartiles, skewnessOpen calculatorPercent Change and Fold Change CalculatorPercent change, fold change, log fold change and percent differenceOpen calculatorConfidence Interval CalculatorCI for a mean (t or z) and for a proportion (Wilson, exact, Wald)Open calculatorLinear Regression CalculatorSlope, intercept, R², standard errors, intervals, residuals and predictionOpen calculatorCorrelation Calculator (Pearson and Spearman)Pearson r or Spearman ρ with a confidence interval and p-valueOpen calculatort-Test Calculator (Welch, Student, One-Sample)Two-sample t-test with CI for the difference and effect sizeOpen calculatorPaired t-Test CalculatorPaired t-test on before-and-after or matched measurementsOpen calculatorOne-Way ANOVA CalculatorANOVA table, η², Levene's test and group summariesOpen calculatorChi-Square Test CalculatorIndependence or goodness of fit, with Yates, Fisher's exact and Cramér's VOpen calculatorEffect Size CalculatorCohen's d, Hedges' g, odds ratio and risk ratio with intervalsOpen calculatorROC Curve and AUC CalculatorROC curve, AUC with Hanley-McNeil interval, and the best thresholdOpen calculatorBland-Altman Analysis CalculatorBias, limits of agreement and their intervals for two methodsOpen calculator

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Service documentation, failure modes and parts for the instruments these calculations are used with.

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