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How can I calculate the slope of my data distribution in Grapher?

Grapher allows a fit curve to be added to any line/scatter plot data. A linear fit curve can be used to calculate the slope of the data distribution.

 

For instance, suppose your scatter plot looks like:

The data appears to follow a general linear trend.

 

The following steps can be used to add a linear fit curve and determine the slope of the line.

  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. Click the Insert button next to the Insert into plot document option.
  6. Click on the screen where you want the text to appear. The equation is in the form Y = M*X+B where M is the slope the line.

The statistics for the linear fit curve display the slope of the equation.

 

Updated October 08, 2018

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