You can visualize the trend of a data series using a trend line for a number of chart types. You can also extend the trend line past the data series in the chart in order to forecast future values and derive past values. There are the following types of trend lines:
You can change all the properties of a trend line that you can define when you add the trend line. You can delete a trend line that you do not need.
The chart is a bar, area, line, portfolio, profile, point, or column diagram or a histogram.
A new element 'trend line' is added beneath the node of the data series.