Trendline is used to visualize general pattern or direction of data series. Trendlines are useful when determining increase or decrease which is statistically distinguished from random behavior.
- In the upper-right corner, click Edit.
- Click Data Series to expand the section.
- Select the series you want to edit.
- Click the checkbox to Show trendline.
- From the Type dropdown, select the trendline type.
Trendline option is available only for scatter and bubble chart type.