Force Index Technical Indicator was developed by Alexander Elder. This index measures the Bulls Power at each increase, and the Bears Power at each decrease. It connects the basic elements of market information: price trend, its drops, and volumes of transactions. This index can be used as it is, but it is better to approximate it using the Moving Average. Approximation with using a short moving average (the author proposes to use 2 intervals) contributes to finding the best opportunity to open and close positions. If the approximations is performed using a long moving average (period 13), the index shows trends changes.
The force of every market movement is characterized by its direction, scale and volume. If the closing price of the current bar is higher than the preceding bar, the force is positive. If the current closing price is lower than the preceding one, the force is negative. The greater the difference in prices is, the greater the force is. The greater the transaction volume is, the greater the force is.
FORCE INDEX (i) = VOLUME (i) * ((MA (ApPRICE, N, i) - MA (ApPRICE, N, i-1))
FORCE INDEX (i) Force Index of the current bar;
VOLUME (i) volume of the current bar;
MA (ApPRICE, N, i) any Moving Average of the current bar for N periods:
Simple, Exponential, Weighted or Smoothed;
ApPRICE applied price;
N period of smoothing;
MA (ApPRICE, N, i-1) any Moving Average of the previous bar.