Trend lines are used to track trends in a data series graphically. Interactive Reporting supports trend lines modeled after linear regression analysis. Generally the trend line is represented as a slanted line that crosses the diagram. For example, the trend line can demonstrate an increase or decrease of values over time. It may be accompanied with the calculated goodness of fit (R-squared) value.
Trend lines can be layered on top of the chart graphics (or Z axis for 3 D charts), or positioned to the background. When data is processed to create the trend line, facts from all pages of the chart are included. Chart items hidden or focused explicitly by the user are not included.
Trend lines are always fact based, and only one trend line can be associated with a single fact column. In Scatter and Bubble charts, the trend line is bound to the data series.
