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# Trend Lines

Trend lines lets you overlay graphs to compare and interpret data.

Like the
Scatter Plot
visualization, you can now set trend lines on a graph visualization to display the rate of change based on linear, exponential, power, or polynomial lines. The Trend Line feature allows you to overlay trend lines on a graph, most commonly over a Time dimension.

For example, in this graph comparison, we can see that Visits are trending up, but Orders are trending down.

To add a Trend Line

- Open a graph and right-click the metric name in the upper left corner.
- Click
**Trend Lines**and select from the options.You can select the trend line to appear over the graph as**Simple Linear**,**Exponential**,**Power**, or**Polynomial**. Polynomial will create a polynomial regression trend line. Simple Linear will create a trend line as the rate of change along the regression line. Exponential calculates a trend line as y = b*exp( a*x ) and Power as y = b*x <sup>a</sup> .The trend will be calculated and rendered on the graph, and a callout will open displaying detailed information of the trend equation.