威廉集散指标是根据背离交易的。当价格走出新高而指标没有成功超过前期高点，说明价格分散。当价格走出新低而WAD没有走出新低，则说明价格正在集聚。WAD指标由Larry Williams开发。

交易信号
• 当WAD指标与价格之间出现看涨背离时做多。
• 出现看跌背离时做空。

示例
澳洲联邦银行(CBA) 股价走势以及  WAD指标。

1. [L] 处看涨背离做多。
计算公式
1. 计算出最高价以及最低价的真实波幅：
    最高价的真实波幅是下面两者中的较大值:
• 今日的最高价
• 昨日的收盘价
    最低价的真实波幅是下列二者中的最小值：
• 今日的最低价
• 昨日的收盘价
2. 比较今日与昨日的收盘价：
• 如果今日收盘价高于昨日收盘价：
           今日的价格波动 = 今日的收盘价 – 最低价的真实波幅
• 如果今日的收盘价低于昨日的收盘价：
           今日的价格波动=今日的收盘价–最高价的真实波幅
• 如果今日的收盘价与昨日的收盘价持平：
           今日的价格波动=0
3. 价格波幅乘以成交量：
                      今日的AD = 今日价格波幅 * 成交量
4. 计算累计值
                      WAD = 今日的AD + 昨日的WAD

Williams Accumulation Distribution
Williams Accumulation Distribution is traded on divergences. When price makes a new high and the indicator fails to exceed its previous high, distribution is taking place. When price makes a new low and the WAD fails to make a new low, accumulation is occurring.
Williams Accumulation Distribution was created by Larry Williams.
Trading Signals
• Go long when there is a bullish divergence between Williams Accumulation Distribution and price.
• Go short on a bearish divergence.
EXAMPLE
Commonwealth Bank of Australia (CBA) is plotted with    Williams Accumulation Distribution.
2. Go long [L] on a bullish divergence.
Setup
See Indicator Panel for directions on how to set up an indicator. Edit Indicator Settings to alter the default settings.
Formula
To calculate Williams Accumulation Distribution:
1. Calculate the True Range High and True Range Low:
    True Range High is the greater of:
• High [today], and
• Closing price [yesterday]
    True Range Low is the lesser of:
• Low [today]
• Closing price [yesterday]
2. Compare Closing price to yesterday's Closing price:
• If Close [today] is greater than Close [yesterday]
           Price Move [today] = Close [today] - True Range Low
• If Close [today] is less than Close [yesterday]
           Price Move [today] = Close [today] - True Range High
• If Close [today] equals Close [yesterday]
           Price Move [today] = zero
3. Multiply the price move by volume:
                      AD [today] = Price Move [today] * Volume [today]
4. Calculate the cumulative total:
                      Williams AD = AD [today] + Williams AD [yesterday]

本文翻译由兄弟财经提供

文章来源：http://www.incrediblecharts.com/indicators/williams_accumulation_distribution.php