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- Published:
- 2010.01.26 11:27
- Updated:
- 2016.11.22 07:32
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Williams' A/D is the accumulated sum of positive "accumulational" and negative "distributional" price movements.
For example, if the current closing price is higher than the previous one, W/AD increases by the difference between the current closing price and the true minimum. If the current closing price is lower than the previous one, W/AD decreases by the difference between the current closing price and the true maximum.
The term "accumulation" denotes a market controlled by purchasers and the term "distribution" means that sellers control the market.
Divergences between the indicator and the price are a signals. Like most indicators, W/AD leads the tool price. In other words, when a divergence appears, the price changes its direction according to the indicator.
- If the price reaches a new maximum, but the accumulation/distribution indicator cannot reach a new maximum, it means that the security is distributing itself. It is a signal for sell.
- If the price reaches a new minimum, but the accumulation/distribution indicator cannot reach a new minimum, it means that the security is accumulating. It is a signal for buy.
Williams'Accumulation/Distribution indicator
Calculation:
To calculate the accumulation/distribution indicator, first you have to find a "True Range High" (TRH) and "True Range Low" (TRL):
TRH (i) = MAX (HIGH (i) || CLOSE (i - 1))
TRL (i) = MIN (LOW (i) || CLOSE (i - 1))
Then you must find the current value of accumulation/distribution (CurA/D) by comparing today and yesterday's closing prices.
If the current closing price is higher than the previous one, then:
CurА/D = CLOSE (i) - ТRL (i)
If the current closing price is lower than the previous one, then:
CurА/D = CLOSE (i) - ТRH (i)
If current and previous closing prices coincide then:
CurА/D = 0
Williams' accumulation/distribution indicator is a growing sum of these values for each day:
WА/D (i) = CurА/D + WА/D (i - 1)
where:
- TRH (i) - the True Range High;
- TRL (i) - the True Range Low;
- MIN - the minimum value;
- MAX - the maximum value;
- || - the logical OR;
- LOW (i) - the minimum price of the current bar;
- HIGH (i) - the maximum price of the current bar;
- CLOSE (i) - the closing price of the current bar;
- CLOSE (i - 1) - the closing price of the previous bar;
- CurА/D - means current value of accumulation/distribution;
- WА/D (i) - the current value of William's Accumulation/Distribution indicator;
- WА/D (i - 1) - the value of William's Accumulation/Distribution indicator on the previous bar.
Translated from Russian by MetaQuotes Ltd.
Original code: https://www.mql5.com/ru/code/54
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