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Implements the Integrated Epanechnikov kernel.
IntEpanechnikov(x)
A vector of design points with values from \(-\sqrt{5}\) to \(\sqrt{5}\).
The value of the integrated kernel function at the user designated points.
Implements:
$$K(u)= \int_{-\infty}^u \frac{3}{4\sqrt{5}} \left (1-\frac{x^2}{5} \right )\,dx$$ for \(|x| \le \sqrt{5}\)
Kernel Statistics
Epanechnikov