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The Williams' Accumulation/Distribution or Williams AD is a technical analysis indicator developed by Larry Richard Williams, who also developed several other trading indicators including the famous Williams %R and the Ultimate Oscillator.
The Williams' Accumulation/Distribution trading indicator was implemented in order to define whether a market is controlled by buyers (known as accumulation) or sellers (distribution). The main idea is to trade on divergences between the Williams' Accumulation/Distribution indicator and the stock, commodity or currency price. A bullish or buy signal occurs when the security price makes a new bottom while the A/D indicator doesn't and a bearish or sell signal occurs when the security price makes a new high while the A/D indicator fails to reach a new top.
Williams A/D function doesn't contain any parameters. The formula first calculates the True Range High and True Range Low then compares today's close price to yesterday's close price to compute a new value. Finally it creates the cumulative total of these daily values to produce the Williams AD indicator.
Example of buy rule using the Williams AD indicator: (Close price reach 30 bar low while Williams AD doesn't reach its 30 bar low)
rule = (llv(close, 30) == close) and (llv(WilliamsAD(), 30) != WilliamsAD());
plot(rule, "Williams AD - Buy Signal", colorGreen);
Williams %R is another technical analysis indicator created by Larry Richard Williams. This indicator is available in QuantShare Trading Software under the name of "Willr".
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