![]() ![]() Press ENTER, then drag the Fill Handle to execute the formula in other cells. Paste the following formula into the G4 cell. Enter the random constant values as shown in the picture below. The "new_x" values are in cells A24:C24, where B24 and C24 are the formulas as shown. A trendline with a polynomial regression equation will automatically appear on the scatterplot: Step 3: Interpret the regression equation. Method 2: Using Polynomial Formula to Make a Trendline Step 1. ![]() The "known_y" values are in green in E3:E22 The "known_x" values are in green in A3:C22 If you change the values in E3:E22, the trend() function will update Cell E24 for your new input at Cell A24.Įdit = The trend() formula is in Cell E24 where the cell references are shown in red.Ĭell A24 contains the new X, and is the cell to change to update the formula in E24Ĭell B24 contains the X^2 formula (A24*A24) for the new XĬell C24 contains the X^3 formula (A24*A24*A24) for the new X Column C is X^3 (two cells to the left cubed). Steps: Firstly, select cell range B5:C10. Column B is X^2 (the cell to the left squared). Excel's built-in trendline function shows a good fit (R20.9999) for a 6th order polynomial, however, If I re-plot the data using the coefficients from the 'Display equation' option, the data diverge significantly. Step-01: Draw Scatter Chart In the first step, you have to insert a scatter chart to do polynomial interpolation in Excel. ![]() Try trend(known_y's, known_x's, new_x's, const).Ĭolumn A below is X. ![]()
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