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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".
Trading financial instruments, including foreign exchange on margin, carries a high level of risk and is not suitable for all investors. The high degree of leverage can work against you as well as for you. Before deciding to invest in financial instruments or foreign exchange you should carefully consider your investment objectives, level of experience, and risk appetite. The possibility exists that you could sustain a loss of some or all of your initial investment and therefore you should not invest money that you cannot afford to lose. You should be aware of all the risks associated with trading and seek advice from an independent financial advisor if you have any doubts.
