Add weighted moving average #29
Description
A weighted moving average is calculated as x = (n*Ct + (n-1)Ct-1 + ... + 1Ct-n) / (n+n-1+n-2+...+1)
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A weighted moving average is calculated as x = (n*Ct + (n-1)Ct-1 + ... + 1Ct-n) / (n+n-1+n-2+...+1)