Here is my attempt to create custom indicator based on second order Epanechnikov kernel, described in 

"Nonparametric estimation of a multidimensional probability density" by V. A. Epanechnikov.

http://www.mathnet.ru/links/74bd23faeeb1ccffdba0a1b221fd436c/tvp1130.pdf

https://en.wikipedia.org/wiki/Kernel_(statistics)

Hope it will be useful in generating alphas on QuantConnect.

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