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Implementation of the Epanechnikov kernel.
Epanechnikov(x)
A vector of data points between \(-\sqrt{5}\) and \(\sqrt{5}\) where the kernel will be evaluated.
The value of the kernel at \(x\)
Implements:
$$K(u)= \frac{3}{4\sqrt{5}} \left (1-\frac{x^2}{5} \right ) $$ for \(|x| \le \sqrt{5}\)
Kernel Statistics
IntEpanechnikov