rRegressionTester Open a calculator

CLEAR RESULTS · LOCAL BY DEFAULT

Regression calculators and testing tools, with the method in plain view.

Calculate a regression fit, compare model outputs, or inspect software changes. Each tool explains what it checks and gives you a way to verify the result.

Try linear regression Explore tool areas

Calculator inputs stay in this browser session. No sign-in needed.

CHOOSE YOUR TASK

Two meanings of regression. One useful toolkit.

Pick the task you came to do. Statistical regression and software regression testing have separate tool paths.

SOFTWARE & MODEL OUTPUTS

Compare and validate outputs

Compare saved JSON or API response files, then validate structured model output against a schema.

Open software testing tools

WORKED EXAMPLES

Guides

Walk through real examples for linear regression, R², RMSE vs MAE and API response changes.

Browse guides

AVAILABLE NOW

Regression calculators

Fit a line, curve or association measure to paired data and inspect the equation, graph and errors.

01Linear regression calculatorEquation, scatter plot, R², RMSE and residualsAvailable 02Quadratic regression calculatorDegree-two curve, vertex, R², RMSE and residualsAvailable 03Exponential regression calculatorLog-space least squares, positive Y, original-scale metricsAvailable 04Logarithmic regression calculatorFit Y against ln(X), positive X, equation and graphAvailable 05Polynomial regression calculatorDegree selector 1–5, QR solve, conditioning warnings and residualsAvailable 06Pearson correlation calculatorScatter plot and r with association-not-causation noteAvailable 07Equation ExplorerPlot math expressions as curves, 3D surfaces, and coordinate-cube dataAvailable

HOW IT WORKS

Bring data in. Check the method. Take the result with you.

1

Paste or load a sample

Map your X and Y columns and see input issues before calculating.

2

Inspect the fit

View the equation, chart, fit metric and row-by-row residuals.

3

Export what you need

Copy the equation or download a portable results summary.

Transparent calculations, no account required

The first calculator runs in your browser. The method, assumptions and edge cases are documented alongside the tool.