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How can I create an RMA (reduced major axis) fit curve in Grapher?

A reduced major axis (RMA) fit method was added as a predefined fit method with the release of Grapher 13. To add this type of fit to your plot in Grapher 14 and newer versions:
  1. Click on the Line/Scatter plot in the Object Manager to select it.
  2. Click Home | Add to graph | Fit Curve. By default, a linear fit will be applied.
  3. Click on the Linear Fit in the Object Manager to select it. 
  4. In the Property Manager, click on the Plot tab.
  5. Change the Fit type field to RMA.

To add this type of fit to your plot in Grapher 13:

  1. Click on the Line/Scatter Plot in the Object Manager to select it.
  2. Click on the Plot tab in the Property Manager.
  3. Click Add/Edit in the Fit curve field.
  4. In the Fits dialog, click in the Available Fits field and select Reduced Major Axis.
  5. Click Add.
  6. Click OK.
Grapher 12 and previous do not support the addition of a reduced major axis regression fit curve.  If you'd like to test this new feature with your data, please download the free Grapher trial.

 

Updated March 6, 2019

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