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#1
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Polynomial Eq Parameters
I have an x and y data set for which I want to identify the parameters
(a,b,c) in the following second order polynomial equation. What Excel functions can do this? I can chart the data and use the trendline function, but I want to automatically calculate the parameters in individual cells that I can reference in another formula. Thanks, J y = ax^2 + bx + c -- Jay |
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#2
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Polynomial Eq Parameters
I would also like to be able to calculate the R-squared value for polynomial
equation as well. Same as the chart trendline feature produces, but with the outcome in a cell rather than displayed on a chart. -- Jay "Jay" wrote: I have an x and y data set for which I want to identify the parameters (a,b,c) in the following second order polynomial equation. What Excel functions can do this? I can chart the data and use the trendline function, but I want to automatically calculate the parameters in individual cells that I can reference in another formula. Thanks, J y = ax^2 + bx + c -- Jay |
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#3
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Polynomial Eq Parameters
Use LINEST as demonstrated at
http://people.stfx.ca/bliengme/ExcelTips/Polynomial.htm best wishes -- Bernard V Liengme www.stfx.ca/people/bliengme remove caps from email "Jay" wrote in message ... I have an x and y data set for which I want to identify the parameters (a,b,c) in the following second order polynomial equation. What Excel functions can do this? I can chart the data and use the trendline function, but I want to automatically calculate the parameters in individual cells that I can reference in another formula. Thanks, J y = ax^2 + bx + c -- Jay |
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#4
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Polynomial Eq Parameters
I would also like to be able to calculate the R-squared value for the
polynomial equation. The chart trendline feature gives an R-squared, but displayed on a chart rather than in a cell . -- Jay "Bernard Liengme" wrote: Use LINEST as demonstrated at http://people.stfx.ca/bliengme/ExcelTips/Polynomial.htm best wishes -- Bernard V Liengme www.stfx.ca/people/bliengme remove caps from email "Jay" wrote in message ... I have an x and y data set for which I want to identify the parameters (a,b,c) in the following second order polynomial equation. What Excel functions can do this? I can chart the data and use the trendline function, but I want to automatically calculate the parameters in individual cells that I can reference in another formula. Thanks, J y = ax^2 + bx + c -- Jay |
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#5
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Polynomial Eq Parameters
Jay -
Use LINEST as suggested by Bernard. The value of R-squared is one of the outputs of the LINEST function. See Excel's Help for details. - Mike http://www.mikemiddleton.com "Jay" wrote in message ... I would also like to be able to calculate the R-squared value for the polynomial equation. The chart trendline feature gives an R-squared, but displayed on a chart rather than in a cell . -- Jay "Bernard Liengme" wrote: Use LINEST as demonstrated at http://people.stfx.ca/bliengme/ExcelTips/Polynomial.htm best wishes -- Bernard V Liengme www.stfx.ca/people/bliengme remove caps from email "Jay" wrote in message ... I have an x and y data set for which I want to identify the parameters (a,b,c) in the following second order polynomial equation. What Excel functions can do this? I can chart the data and use the trendline function, but I want to automatically calculate the parameters in individual cells that I can reference in another formula. Thanks, J y = ax^2 + bx + c -- Jay |
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