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Point Biserial Correlation Calculator
Calculate the point-biserial correlation between a binary variable and a continuous score.
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Calculate the point-biserial correlation between a binary variable and a continuous score.
Point Biserial Correlation Estimator
Enter your numbers below for an instant estimate.
0
๐ก Tip: Use point biserial when one variable is truly dichotomous and the other continuous.
How It Works
Key concepts behind this calculator
1
Enter Values
Fill in each field with your own numbers.
2
Calculate
Results update as you change the inputs.
3
Review
Read the breakdown and the explanation.
4
Adjust
Change values to compare scenarios.
Quick Reference Guide
Point Quick Guide
Typical values for reference.
| r | Strength | Variance Explained | Note |
|---|---|---|---|
| 0.1 | Small | 1% | Weak |
| 0.3 | Medium | 9% | Moderate |
| 0.5 | Large | 25% | Strong |
| 0.7 | Very large | 49% | Very strong |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Point Biserial Correlation Calculator FAQ
Answers to common questions about this calculator.
A correlation between a binary and a continuous variable.
(M1 – M0) / s times sqrt(pq).
It is Pearson with a 0/1 variable.
The share of cases in group 1.