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?