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Analyze relationships between two variables. Calculate correlation coefficients and regression to uncover cause-and-effect patterns.
y = 0.88x + 8.39All calculations are processed locally. Your data never leaves your browser.
Scatter Diagrams reveal relationships between two variables. Instantly see whether variables move together (positive correlation), move opposite (negative), or have no relationship at all.
Calculate the best-fit regression line automatically. Get the slope, intercept, and R² value to quantify the relationship strength and predict future values.
Easily spot outliers that fall far from the trend line. These unusual points often reveal special causes or data entry errors that warrant investigation.
Create Scatter Diagrams to analyze relationships between two variables. Calculate correlation coefficients (r value), R-squared, and regression equations. Verify cause-and-effect relationships with our free online scatter plot tool.
A Scatter Diagram plots paired observations on an X-Y axis to reveal relationships between variables. Each point represents one observation, with its X and Y coordinates determined by the two variables being compared.
This visualization is essential for verifying cause-and-effect relationships hypothesized in Fishbone Diagrams. If a potential cause truly affects the outcome, a scatter plot will show the correlation.
The correlation coefficient (r) ranges from -1 to +1. Values near +1 indicate strong positive correlation (both variables increase together). Values near -1 show strong negative correlation (one increases as the other decreases). Values near 0 suggest no linear relationship.
R² (R-squared) tells you what percentage of variation in Y is explained by X. An R² of 0.81 means 81% of Y's variation can be predicted from X.
Scatter Diagrams work best as part of a complete analysis. Use Check Sheets to collect the paired data, Scatter Diagrams to verify relationships, and Control Charts to monitor the key variable over time.
Export your data and regression equation for reports and further analysis—all free with Zrubix TQM Tools.
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