Linear
A straight line. Use it for proportional relationships, calibration lines and any data you expect to change at a constant rate.
Fit the example dataStart with your own data
Example: Pearson’s data with York’s weights, 10 points with x and y uncertainties, opened as a new copy you can edit.
Parameters
- Slope: the change in y per unit of x.
- Intercept: the value of y at x = 0.
Tips
- With δx selected, curve.fit uses orthogonal distance regression, so uncertainties in x count as well as uncertainties in y.
- To force the line through the origin, enter 0 as the Guess for b and check Fix.
- When x = 0 is far from your data, b is an extrapolation: its uncertainty is large and strongly correlated with m.