![]() ![]() The "new_x" values are in cells A24:C24, where B24 and C24 are the formulas as shown. For example, suppose column A contains y-values and column B contains x-values. You can use TREND for polynomial curve fitting by regressing against the same variable raised to different powers. Power trendline Equation: ycxb c: EXP(INDEX(LINEST(LN(y),LN(x),),1,2)). For information about how Microsoft Excel fits a line to data, see LINEST. The "known_y" values are in green in E3:E22 Nonlinear trendlines also have equations, and they are a bit more complex. 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). Column B is X^2 (the cell to the left squared). Try trend(known_y's, known_x's, new_x's, const).Ĭolumn A below is X. You then have Excel plot the trend line and report the equation and the r2 value. ![]()
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