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Elder's Force Index
XAVG((C - C1) * V, x)
Where x is the Period of the Force Index.
The slow / trigger line is an exponential moving average of the raw Force Index.
XAVG(XAVG((C - C1) * V, x), s)
Where x is the Period of the Force Index and s is the period of an exponential moving average applied to the raw Force Index.