Question: Cubic regression splines: A) always include constraints that the splines at the outer edges of the range should be linear B) with K regions require

Cubic regression splines:

A) always include constraints that the splines at the outer edges of the range should be linear

B) with K regions require K knots

C) none of the other options

D) include constraints that, for splines on either side of any knot, the values, first derivatives, and second derivatives of the spline functions are all continuous

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