A linear regression line enables you to view the trend line of your scatterplot dataset at a glance. Adding one in Chartio is as simple as checking a checkbox in your chart settings.
First, open your scatterplot chart in the Data Explorer. Click on the Chart Settings button, located on the righthand side above the chart preview.
In the Chart Settings, check the Linear Regression checkbox. Click Refresh Chart to preview your changes in the modal.
Be sure to save your changes before exiting the Data Explorer.