Calculate the alpha (decay factor) used in EWMA from specified half-life and interval between observations. Half-life is the interval over which the weights decrease by a factor of two. The relevance of each data sample is halved for every passing half-life duration, i.e. after 4 times the half-life, a data sample's relevance is reduced to 6% of its original relevance. The initial relevance of a data sample is given by 1 – 0.5 ^ (collect-interval / half-life).

public static double CalculateAlpha(
	TimeSpan halfLife,
	TimeSpan collectInterval
)

static member CalculateAlpha : 
        halfLife : TimeSpan * 
        collectInterval : TimeSpan -> float