A LITTLE CONTEXT
How to use correlation coefficient calculator
- Enter or edit the example values in the input panel.
- Review the method below and choose the options that match your task.
- Run the tool, check the result, and copy or download it. Reset restores the example; Clear removes your input and result.
Method & assumptions
Pearson r = Σ(dx·dy) / √Σ(dx²) / √Σ(dy²). Both series must have nonzero variance.
Pearson correlation measures linear association between paired numeric observations. It does not establish causation, and constant series have undefined correlation.
Result units: Pearson correlation r (dimensionless)
Worked example
- X observations
- 1, 2, 3
- Y observations
- 2, 4, 6
1