Yes! Grapher has the ability to create a fit curve, limit it to an X range of data, and get the equation. To do so:

- Click on the
*Line/Scatter Plot*in the**Object Manager**to select it. - Click
**Graph Tools | Add to graph | Fit Curve.**By default, a linear fit will be applied. - Click on the
*Linear Fit*in the**Object Manager**to select it. - In the
**Property Manager**, click on the**Plot**tab. - In the
*Fitted Plot*section, uncheck the box next to*Apply fit to entire plot*. - Update the
*Minimum plot value to fit*and*Maximum plot value to fit*with the x values for the range of data you would like to use. For example, if you want to limit the equation to the red area on this graph, type in 40900 for*Minimum plot value to fit*and 40945 for the*Maximum plot value to fit*.

After changing the fit curve *Fitted Plot* properties, your fit curve will be reduced to the area in red.

- To get the equation of the line:

- Click the
*Linear Fit*plot. - In the
**Property Manager**, click on the**Plot**tab. - In the
*Statistics*section, click the button next to one of the commands.- Clicking on the
*Copy*button next to the*Copy to clipboard*command copies the information to the Windows clipboard for pasting into Grapher or another program. - Clicking on the
*Display*button next to the*Display report* - Clicking on the
*Insert*button next to the*Insert into plot document*command allows you to click in the plot document window and have the fit curve information displayed as an editable text object.

- Clicking on the

- Click the

*Updated October 08, 2018*

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