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Nonlinear regression using excel's data analysis tool

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Nonlinear Regression Using Excel's Data Analysis Tool

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Confused  I’m trying to understand how to make use of the equation suggested by excel when fitting a trendline through the following set of data

x
y
2004
17%
2005
19%
2006
22%
2007
24%
2008
25%
2009
26%

and selecting the polynomial curve as the best fit. The regression returns the following coefficients:

Y=-0.0022x^2 +8.8713x-8919.6

So to evaluate Y when x=2010 I would calculate:

Y=-0.0022*(2010)^2 +8.8713*2010-8919.6

Which results in Y being equal to 23.493  which is non sensible and doesn’t match the Y value the graph would imply for the year 2010 (something around 27%).




Can somebody please tell me what I’m doing wrong?
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Confused Setting up a nonlinear regressionAfter opening XLSTAT, select the XLSTAT / Modeling data / Nonlinear regression command. The nonlinear regression dialog box pops up. Select the data on the Excel sheet. The Dependent variable (or variable to model, or response variable) is in our case the "Speed".
Regards,Rachel Gomez
 rachel
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Confused
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That makes perfect sense actually. Thanks so much!
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Confused
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Hi
the software take x as 1,2,3,4,5,6
not as you expecet as 2004,2005......2009
then if you aplay x=7    (which should be 2010)

the result will be close to what you expect
 All the best - m.saad
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