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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
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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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Confused
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That makes perfect sense actually. Thanks so much!
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