Investor's wiki

Accumulative Swing Index (ASI)

Accumulative Swing Index (ASI)

What Is the Accumulative Swing Index (ASI)?

The Accumulative Swing Index (ASI) is a trendline indicator utilized by technical traders to measure the long-term trend in a security's price, drawing on candlestick charts by all in all utilizing its opening, closing, high, and low prices.

Understanding the Accumulative Swing Index

The Accumulative Swing Index (ASI) is a variation of J. Welles Wilder's swing index. The ASI was developed by Wilder as an improvement on the swing Index. Subtleties talking about the ASI can be found in Wilder's book "New Concepts in Technical Trading Systems."

The Accumulative Swing Index trendline is one of several trendlines that can be followed to offer help for technical analysts unraveling buy and sell signals. Other well known indicators incorporate weighted alpha, moving average, and the volume-weighted moving average.

The Accumulative Swing Index is charted as a trendline. It very well may be conveyed through advanced technical charting software like MetaStock, Worden TC2000, eSignal, NinjaTrader, Wave59 PRO2, EquityFeed Workstation, ProfitSource, VectorVest, and INO MarketClub. It is commonly charted below the principal price chart as a standalone trendline, diagramed like volume bar charts. Both the Accumulative Swing Index and the Swing Index can be added to a technical expert's chart diagram.

Computing the Swing Index

In Wilder's research, he set out to distinguish an index indicator that could give information on a security's price by and large dissecting the security's open, close, high, and low price. These prices charted on a daily candlestick pattern are integrated into the following equation developed by Wilder to show up at a Swing Index measure.
SI=50√ó(Cy‚ąíC+12(Cy‚ąíOy)+14(C‚ąíO)R)√óKTwhere:SI=Swing¬†indexC=Today‚Äôs¬†closing¬†priceCy=Yesterday‚Äôs¬†closing¬†priceH=Today‚Äôs¬†highest¬†priceHy=Yesterday‚Äôs¬†highest¬†priceK=The¬†larger¬†of¬†Hy‚ąíC¬†and¬†Ly‚ąíCL=Today‚Äôs¬†lowest¬†priceLy=Yesterday‚Äôs¬†lowest¬†priceO=Today‚Äôs¬†opening¬†priceOy=Yesterday‚Äôs¬†opening¬†priceR=Varies¬†based¬†on¬†the¬†relationship¬†betweenC,¬†Hy¬†and¬†Ly¬†(see¬†table¬†below)¬†T=The¬†maximum¬†amount¬†of¬†price¬†change¬†for¬†the¬†day\begin &\text = 50 \times \left ( \frac{ C_y - C + \frac {1}{2} \left ( C_y - O_y \right ) + \frac {1}{4} \left ( C - O \right ) } \right ) \times \frac \ &\textbf\ &\text = \text \ &C = \text{Today's closing price} \ &C_y = \text{Yesterday's closing price} \ &H = \text{Today's highest price} \ &H_y = \text{Yesterday's highest price} \ &K = \text H_y - C \text L_y - C \ &L = \text{Today's lowest price} \ &L_y = \text{Yesterday's lowest price} \ &O = \text{Today's opening price} \ &O_y = \text{Yesterday's opening price} \ &R = \text \ &C \text{, } H_y \text L_y \text{ (see table below) } \ &T = \text \ \end
The Swing Index calculation was developed to consolidate differences between sequential day closing prices and opening prices in consideration with a variable R defined below:
To¬†obtain¬†R,¬†first¬†determine¬†the¬†largest¬†of:(1)¬†H‚ąíCy(2)¬†L‚ąíCy(3)¬†H‚ąíLIf¬†(1)¬†is¬†largest,¬†R=H‚ąíCy‚ąí12(L‚ąíCy)+14(Cy‚ąíOy)If¬†(2)¬†is¬†largest,¬†R=L‚ąíCy‚ąí12(H‚ąíCy)+14(Cy‚ąíOy)If¬†(3)¬†is¬†largest,¬†R=H‚ąíL+14(Cy‚ąíOy)\begin &\text R \text{, first determine the largest of:} \ &\text{(1) } H - C_y \ &\text{(2) } L - C_y \ &\text{(3) } H - L \ &\ &\text{If (1) is largest, } R = H-C_y - \frac{1}{2} ( L-C_y ) + \frac{1}{4} ( C_y - O_y ) \ &\text{If (2) is largest, } R = L-C_y - \frac{1}{2} ( H-C_y ) + \frac{1}{4} ( C_y - O_y ) \ &\text{If (3) is largest, } R = H-L + \frac{1}{4} ( C_y - O_y ) \ \end
This core value is duplicated times 50 and K/T, where T is the maximum amount of a price change for the afternoon.

Everything the Accumulative Swing Index Says to You

The Swing Index Value is then accumulated to form the Accumulated Swing Index trendline. This trendline value ordinarily falls inside a scope of 100 to - 100. As a price-driven index, it will generally follow the candlestick pattern of a price. The Swing Index and ASI can be utilized in dissecting a wide range of securities. It is frequently utilized for futures trading yet can be utilized for breaking down the price trends of different assets too.

The ASI is known for supporting the certification of breakouts.

The ASI might be utilized related to trading channels to affirm breakouts as the equivalent trendline is to be entered in the two circumstances. Generally, when the ASI is positive, it supports that the long-term trend will be higher, and when the ASI is negative, it recommends that the long-term trend will be lower.


  • The ASI is utilized to gain a better long-term picture than the plain swing index, which utilizes data from just daily price points, gives.
  • On the off chance that the long-term trend is up, the accumulative swing index is a positive value. On the other hand, on the off chance that the long-term trend is down, the accumulative swing index is a negative value.
  • The Accumulative Swing Index (ASI) is a modified rendition of Wilder's swing index that utilizes candlestick charts to aggregate open, close, high, and low prices for a security.