Excel trendline polynomial equation1/14/2024 ![]() ![]() If you need more assistance, please attach an example Excel file with representative data that demonstrates the problem that you perceive. A polynomial or curvilinear trendline uses this equation to calculate the least squares fit through points: where b and are constants. for X values outside the original range), often the trendline formula "blows up", taking wildly unexpected turns (literally). However, also note that most polynomial trendlines are useful only for interpolating estimated Y values. A1:G1), and array-enter (press ctrl+shift+Enter instead of just Enter) a formula of the form: For example, select 7 consecutive horizontal cells (e.g. A trendline with a polynomial regression equation will automatically appear on the scatterplot: Step 3: Interpret the regression equation. But if all of the coefficients are "close" in magnitude, you might use Number with sufficient decimal places.Įven better: Use LINEST to generate the coefficients. That works regardless of the magnitude of the coefficients. I prefer Scientific with 14 decimal places. If you copying the coefficient from the trendline label, be sure to format the TL to display 15 significant digits. ![]() Re: ``I am using the polynomial given to me in the trendline, 6th order but it does not compute properly``
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