Residual Calculator
Find the residual between an observed and predicted value.
A residual is how far an observed value falls from the regression prediction.
The math behind it
residual = observed - predicted. Positive means above the line; squared residuals feed into the model error.
Worked example
Observed 52, predicted 48 gives a residual of 4.
FAQ
Why look at residuals?
Patterns in residuals reveal whether a model fits well.