Add regression lines
You can add a regression line to your chart.
To add a regression line, you need a search with only one attribute and one measure. Otherwise, this option is greyed out in the settings panel. As soon as you modify the search to contain a single measure and attribute, the regression line option is clickable.
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While viewing your answer as a chart, click the chart configuration icon on the top right.
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Click Settings at the bottom of the Customize menu.
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Select Regression line.
You can show regression lines on most types of charts (bar, stacked bar, line, bubble, and so on).
In the following examples, sales
is the measure and department
is the attribute.