Statistics & Probability
Run statistical tests, distributions, regressions, and probability calculations for research and data science.
Expected Value Calculator — Predict Weighted Outcomes & Measure Risk
Empirical Rule Calculator — 68-95-99.7 Normal Distribution & Z-Score
Cubic Regression Calculator — Fit Third-Degree Polynomials & Predict Y
Dice Probability Calculator — Exact Odds for Any Roll
Degrees of Freedom Calculator: Formulas, Tables & Critical Values
Critical Value Calculator: Z, T, Chi-Square & F-Distribution Tables
Covariance Calculator — Joint Variability & Pearson r Analysis
Confusion Matrix Calculator: Accuracy, F1 Score, MCC & Full Metrics
Conditional Probability Calculator — Bayes’ Theorem & Event Dependence
Cohen’s d Effect Size Calculator: Formula, Interpretation & Practical Guide
Coefficient of Variation Calculator — Compare Dispersion Across Any Dataset
R² Calculator — Coefficient of Determination & Adjusted R²
Chi-Square (χ²) Calculator — Test of Independence & Goodness of Fit
Chebyshev’s Theorem Calculator — Data Spread & Outlier Bounds
Bonferroni Correction Calculator: Adjust Alpha for Multiple Comparisons