Adding a Fit Curve

Grapher includes many predefined fit curves as well as a tool for creating custom fit curves. XY and histogram data can be fitted, and statistical information can be displayed for the fit curves in the plot or in a report. To add a fit curve,

1. Click 1Q_Data in the Object Manager to select the scatter plot.

2. Click the Graph Tools | Add to Graph | Fit Curve command. A linear fit is added by default.

3. Click Linear Fit - 1Q_Data in the Object Manager select the fit curve.

4. Click the Plot tab in the Property Manager to display the fit curve properties.

5. Set the Significant digits property to 4.

6. Click Insert next to the Insert into plot document field to add a table of fit statistics to the plot window. The cursor changes to a cross-hair to indicate draw mode.

7. Click the position in the plot window where you want to add the fit statistics.

Now a linear fit curve and various fit statistics are displayed in the plot window.

 

Adding fit curves helps explore and understand possible relationships in the data.

 

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