Summary: After creating a chart in MS Excel, insert a trendline for the data series.
Microsoft Excel is commonly used for business analysis of data sets. For this example, MS Excel 2007 will be used.
The starting point for this example will be a pre-existing chart.
Right mouse click on the data series.
Select Add Trendline. (Figure 1)
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Choose Linear.
Optionally select “Display Equation on chart”
Forecast forward 1 to 2 periods for effect