The polynomial and power trendlines are better fits. You’ll find that exponential, linear, and logarithmic are visibly poor fits. Also check the box beside Display R-squared value on the chart.Ĭlick through each of the trendline options. This way you can see the equation of the lines that each fit uses. If you aren’t sure what equation fits the data best, you can click through the equation types to find the right one.īefore doing that, scroll down in the task pane and select Display Equation on Chart. The default trendline uses a linear equation, but there are several other options. The Format Trendline task pane will open: Right-click the data series and select Add Trendline. You’ll see that the data is non-linear:Įxcel is able to add trendlines to non-linear curves. Select the data and create an XY scatter chart. The worksheet contains pressure and flow data for a valve in a piping system. Excel has a few different options for fitting these curves. In those cases, you’ll need to use nonlinear methods. In engineering, you’ll encounter data than doesn’t follow a linear trend.
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