T-tests and ANOVA
Independent Samples T-Test: How to Run, Interpret and Report It
Everything you need to compare two group means, from assumptions and Levene's test to Welch's correction, Cohen's d and an APA-ready write-up.
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effect size
T-tests and ANOVA
One-Way ANOVA Explained: Assumptions, Post Hoc Tests and APA Reporting
Compare three or more group means the right way, with a worked example covering the F-test, Welch's F, Tukey post hoc comparisons, effect sizes and APA reporting.
Nonparametric tests
Mann-Whitney U Test: When to Use It Instead of a T-Test (With Examples)
The nonparametric alternative to the independent t-test, explained with a worked example, effect size r and an APA-ready write-up.
Chi-square and categorical data
Chi-Square Test of Independence: Step-by-Step Guide with Example
Test whether two categorical variables are related, with a worked example, the expected-count rule, standardized residuals, Cramér's V and an APA write-up.
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Independent Samples T-Test CalculatorFree two-sample t-test calculator with Student and Welch results, Levene’s test, 95% CI, Cohen’s d and Hedges’ g. Paste data from Excel.One-Way ANOVA CalculatorFree one-way ANOVA calculator with Levene’s test, Welch’s F, eta squared, omega squared and Tukey HSD post-hoc comparisons. APA tables in seconds.Chi-Square Test of Independence CalculatorFree chi-square test calculator from raw data or a contingency table: expected counts, Yates correction, likelihood ratio, Cramér’s V and residuals.Multiple Linear Regression CalculatorFree multiple regression calculator: B, SE, standardized beta, t, p, 95% CI and VIF for each predictor, with R², ANOVA and automatic dummy coding.Cronbach’s Alpha CalculatorFree Cronbach’s alpha calculator: reliability with 95% CI, standardized alpha, corrected item-total correlations and alpha if item deleted.PROCESS Macro OnlineRun Hayes’ PROCESS macro models 1 to 76 online, free: mediation, moderation, moderated mediation, bootstrap CIs and index of moderated mediation.CB-SEM Studio app (drag-and-drop model builder)Free CB-SEM app: draw your SEM model, run CFA and SEM by maximum likelihood, and get fit indices, CR, AVE, HTMT, mediation and modification indices.PLS-SEM Studio appFree PLS-SEM app: draw your model, run bootstrapping, test mediation and moderation, check HTMT and reliability, and run fsQCA. Nothing to install.Exploratory Factor Analysis (EFA) OnlineFree exploratory factor analysis online: KMO, Bartlett’s test, principal axis factoring, varimax rotation, scree plot and sorted factor loadings.Mann-Whitney U Test CalculatorFree Mann-Whitney U test (Wilcoxon rank-sum) calculator with mean ranks, z, exact or asymptotic p-value and effect size r. For ordinal or skewed data.Power Analysis and Sample Size CalculatorFree a priori power analysis for t-tests, ANOVA, correlation, proportions, chi-square and regression. Required sample size and power curve, like G*Power.Data Cleaning and Coding ToolClean and code data online for free: SPSS-style variable view, value labels, recode, reverse-code Likert items, missing values, duplicates and outliers.