The Titanium data set describes measurements of a certain property of titanium as a function of temperature.
The format is:
Two columns called ‘x’ and ‘y’, the first being the temperature.
These data have become a standard test for data fitting since they are hard to fit by classical techniques and have a significant amount of noise.
Boor, C. de, and J. R. Rice (1968). Least squares cubic spline approximation II – Variable knots, CSD TR 21, Comp.Sci., Purdue Univ.
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