Accumulative Swing Index
The Accumulative Swing Index (ASI) is a variation of Welles Wilder’s swing index. It plots a running total of the swing index value for each bar. This indicator is credited for being able to show the longer term trend of a given security then the regular swing index. Below is an example of how it looks on a chart. 
It can be used to confirm breakouts of a given security. If this siganl breaks out to the upside at the same time the stock breaks out to the upside it is a buy signal. The opposite is true for new lows. The calculation for the Accumulative Swing Index (ASI) looks like this SI(i) = 50*(CLOSE(i-1) - CLOSE(i) + 0,5*(CLOSE(i-1) - OPEN(i-1)) + 0,25*(CLOSE(i) - OPEN(i)) / R)*(K / T)ASI(i) = SI(i-1) + SI(i) Where SI (i) — current value of Swing Index technical indicator; SI (i - 1) — stands for the value of Swing Index on the previous bar;CLOSE (i) — current close price;CLOSE (i - 1) — previous close price; OPEN (i) — current open price; OPEN (i - 1) — previous open price;R — the parameter we get from a complicated formula based on the ratio between current close price and previous maximum and minimum;K — the greatest of two values: (HIGH (i - 1) - CLOSE (i)) and (LOW (i - 1) - CLOSE (i));T — the maximum price changing during trade session;ASI (i) — the current value of Accumulation Swing Index.
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