A fitted regression line on a graph represents of the mathematical regression equation for your data. Use fitted regression lines to illustrate the relationship between a predictor variable (x-scale) and a response variable (y-scale) and to evaluate whether the model fits your data.

A regression fit line can be drawn to fit a linear, quadratic, or cubic model.

Example of using fitted regression lines to determine the model

You are studying the relationship between a particular machine setting and the amount of energy consumed. You suspect that this relationship has curvature, but you need to confirm and document the curvature. You produce the following plots:

Add a fitted regression line to a graph

Fitted regression lines can be added to graphs such as scatterplots and matrix plots.

To add or edit a fitted regression line when you create a graph, in the dialog box for the graph you are creating, click Data View, and choose the Regression tab.

To add a fitted regression line to an existing graph, right-click the graph and choose Add > Regression Fit.

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