How to calculate Polynomial Trendline Values 5th and 6th degree

D_Spark

Board Regular
Joined
Feb 4, 2007
Messages
232
The trendline that produces a best fit for my data is a six factor polynomial. Excel displays the full equation on the chart. I wanted to work out a way to obtain my trendline values? I needed these trendline values to know exactly where my actual datapoints fall relative to my trendline.

I have based my calculations on the following formula

=(INDEX(LINEST($J$3:$J$62,$A$3:$A$62^{1,2,3}),1)*A3^3)+(INDEX(LINEST($J$3:$J$62,$A$3:$A$62^{1,2,3}),1,2)*A3^2)+(INDEX(LINEST($J$3:$J$62,$A$3:$A$62^{1,2,3}),1,3)*A3^1)+INDEX(LINEST($J$3:$J$62,$A$3:$A$62^{1,2,3}),1,4)

Can some please advise of the correct formula syntax for my requirements for six factor polynomial and also what would the formula look like for a five factor polynomial:




Thanks
 

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