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![]() ![]() Note: that a trendline can not be added to the following types of charts and graphs: In our example, the choice of the linear approximation has given a low accuracy and poor result. If R2 = 1, the approximation error is zero. To this end, we need to extend the line and determine its values. It is used for making predictions based on statistical data. Trendline in Excel is an approximating function chart. Select the line type and enter R-squared value (the approximation accuracy value) in the chart.
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