Question: Consider two regression models.One is a natural cubic spline with 15 degrees of freedom. Another one is a degree-14 polynomial (with 15 degrees of freedom).

Consider two regression models.One is a natural cubic spline with 15 degrees of freedom. Another one is a degree-14 polynomial (with 15 degrees of freedom). What would be expected to see in terms of the fit around the boundary (where predictor values are very small or very large.)

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