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

Grapher 13 has added a reduced major axis (RMA) fit method to the list of predefined fit methods. To use add this fit to your plot:
  1. Click on the Line/Scatter Plot in the Object Manager to select it.
  2. Click Graph Tools | 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.
Grapher 12 and previous do not have an automatic way to create the reduced major axis regression equation directly. However, there is a script available that does calculate the RMA equation and add it to your existing graph as a function plot. That script and instructions for running it are available here: https://support.goldensoftware.com/hc/en-us/articles/227835267-How-can-I-create-an-RMA-reduced-major-axis-fit-curve-in-a-Grapher-script-.

 

Updated October 08, 2018

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