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Can I extrapolate with the Cubic Spline?

Document ID: DQ023
Relevant to following products: Manta WorkOut 2.0
Document description: How to: Allow/disallow extrapolation with a Cubic Spline…



It is not mathematically correct to extrapolate a Cubic Spline, however a number of applications require this feature.  Rather than using the Cubic Spline segments (with continuous derivatives) outside the range of standards, the software supports extrapolation by assuming a linear relationship between X and Y outside of the Cubic Spline range. 
 
This option can be specified (i.e. you can allow/disallow extrapolation) using the Range tab of the Standard Curve Fit transform properties.
 
 




Related articles:
DQ024: Why are the MSE and SS of my Cubic Spline large?
How is the MSE and SS of Cubic Spline calculated?

DQ010: My Cubic Spline has a kink in it
How To: Use Cubic Spline with non-linear data…

DQ065: Which curve fit should I use?
How To: Choose a curve fit method...





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