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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.

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