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The Force Index includes volume and closing price to identify bullish (high positive Force Index), bearish (low negative Force Index) or non-trending (oscillates around zero) stocks. Long positions are assumed if the Force Index is less then zero when there is a bullish divergence. Short positions are assumed if the Force Index is greater then zero and there is a bearish divergence.
The Force Index is calculated as: (Close,today - Close,yesterday) * Volume. This calculation produces a curve with many rapid movements, so the line which is presented is actually an exponential moving average of the above formula. The Force Index requires one parameter which is the moving average period.
