Free interactive student tool
Free Correlation Coefficient Calculator
Free Correlation Coefficient Calculator. Pearson and Spearman modes with scatterplot and interpretation limits.
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Standardized covariance
How this tool reaches its result
Pearson r measures linear association; Spearman rho measures monotonic association using ranks.
Standardized covariance
Worked context
How to interpret the output
An r of .70 indicates a strong positive linear association in the sample, not causation.
Important limitation
What the result cannot decide for you
Inspect a scatterplot and influential observations before interpreting the coefficient.