I have the Epanechnikov kernel that looks like this:
$K(x) = \frac{3}{4} * (1 - x^2)$
I have added $\sigma$ to the equation so that I can adjust the width, very much like the gaussian kernel.
It looks like this:
$K(x) = \frac{3}{4} * \left(1 - \left(\frac{x}{\sigma^2}\right)^2\right)$
Can someone verify that the above equation is correct?