r
Statistical Tools
Correlation Coefficient Calculator
Calculators
Core calculators for common correlation coefficients and multi-variable analysis.
Correlation Calculator
Main calculator for Pearson, Spearman, Kendall tau, point-biserial, and correlation matrix workflows.
Pearson Correlation Calculator
Linear correlation calculator with scatter plot, p-value, and worked steps.
Spearman Correlation Calculator
Rank-based calculator for ordinal, skewed, and monotonic data.
Kendall Tau Correlation Calculator
Tie-aware Kendall tau calculator for smaller samples and ordered data.
Point-Biserial Correlation Calculator
Binary-versus-continuous calculator with effect sizes and t-test equivalence.
Correlation Matrix Calculator
Multi-variable matrix builder with heatmap, p-values, and export tools.
Partial Correlation Calculator
Control for a third variable using raw data or known correlation values.
Significance & Reporting
Pages that help users turn an r value into a statistical conclusion.
P-Value for Correlation
Test whether an existing correlation coefficient is statistically significant.
Confidence Interval for Correlation
Calculate a Fisher z confidence interval for r and copy APA output.
Sample Size for Correlation
Plan sample size, power, and minimum detectable correlation before collecting data.
R-Squared Explained
Understand r squared as explained variance and compare it with significance.
Interpret a Correlation Coefficient
Read direction, strength, p-value, confidence interval, and practical meaning together.
Formulas & Guides
Concept pages for learning what correlation means and how the formulas work.
Correlation Guides
Guide hub for correlation concepts, interpretation, causation, and method choice.
What Is Correlation?
Foundational guide explaining correlation, coefficients, interpretation, and examples.
Correlation Coefficient Formula
Learn Pearson r with formulas, symbol-by-symbol explanation, and step-by-step calculation.
Correlation vs Causation
Understand why association alone does not establish causality.
Correlation Examples
Practice datasets and worked examples for Pearson, Spearman, Kendall, and point-biserial.
Method Workflows
Decision guides and spreadsheet workflows for applied analysis.
Correlation in Excel
Calculate correlation in Excel or Google Sheets with CORREL, ToolPak, and formulas.
Pearson vs Spearman
Compare linear Pearson correlation with rank-based Spearman correlation.
Correlation vs Regression
Choose correlation, regression, or multiple regression for your research question.
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Calculators
Correlation Calculator
Pearson Correlation Calculator
Spearman Correlation Calculator
Kendall Tau Correlation Calculator
Point-Biserial Correlation Calculator
Correlation Matrix Calculator
Partial Correlation Calculator
Significance & Reporting
P-Value for Correlation
Confidence Interval for Correlation
Sample Size for Correlation
R-Squared Explained
Interpret a Correlation Coefficient
Formulas & Guides
Correlation Guides
What Is Correlation?
Correlation Coefficient Formula
Correlation vs Causation
Correlation Examples
Method Workflows
Correlation in Excel
Pearson vs Spearman
Correlation vs Regression
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