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This sort of curve is approximately a second order polynomial but going up one order takes out any bias. For such a simple curve it is more than adequate.
Polynomial: Third Order (Y=A + B*X + C*X^2 + D*X^3)
Best-fit values
A 5506
B 568.8
C 19.88
D -0.2191
Std. Error
A 312.7
B 24.77
C 3.334
D 0.1630
95% Confidence Intervals
A 4511 to 6501
B 490.0 to 647.6
C 9.269 to 30.49
D -0.7379 to 0.2996
Goodness of Fit
Degrees of Freedom 3
Rē 0.9992
Absolute Sum of Squares 383238
Sy.x 357.4
Data
Number of X values 7
Number of Y replicates 1
Total number of values 7
Number of missing values 0
does this data help?
Note how small the D coefficient is.
Bert
Last edited by avandonk; 16-04-2009 at 02:17 PM.
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