What is the Least Squares Calculator?

The Least Squares Calculator is a statistical tool that helps users find the best-fitting line for a set of data points using the least squares method. By entering X (independent) and Y (dependent) values, the calculator computes the slope and intercept of the regression line, predicted Y values, and residuals for each data point. This helps analyze how well a line fits the data, detect patterns, and make predictions.

How to Use:

1. Enter X Values (comma-separated): Input the independent variable data points, e.g., 1, 2, 3, 4, 5.
2. Enter Y Values (comma-separated): Input the dependent variable data points corresponding to each X, e.g., 2, 4, 5, 4, 5.
3. Click “Calculate”: The calculator computes the slope, intercept, predicted Y values (Ŷ), and residuals (Y − Ŷ).
4. Review Result: The output displays the regression equation, slope, intercept, and a detailed least squares table showing X, actual Y, predicted Y, and residuals, allowing you to analyze the fit of your data.