威廉集散指標是根據背離交易的。當價格走出新高而指標沒有成功超過前期高點，說明價格分散。當價格走出新低而WAD沒有走出新低，則說明價格正在集聚。WAD指標由Larry Williams開發。
交易信號
• 當WAD指標與價格之間出現看漲背離時做多。
• 出現看跌背離時做空。
示例
澳洲聯邦銀行(CBA) 股價走勢以及 WAD指標。
1. [L] 處看漲背離做多。
計算公式
1. 計算出最高價以及最低價的真實波幅：
最高價的真實波幅是下面兩者中的較大值:
• 今日的最高價
• 昨日的收盤價
最低價的真實波幅是下列二者中的最小值：
• 今日的最低價
• 昨日的收盤價
2. 比較今日與昨日的收盤價：
• 如果今日收盤價高於昨日收盤價：
今日的價格波動 = 今日的收盤價 – 最低價的真實波幅
• 如果今日的收盤價低於昨日的收盤價：
今日的價格波動=今日的收盤價–最高價的真實波幅
• 如果今日的收盤價與昨日的收盤價持平：
今日的價格波動=0
3. 價格波幅乘以成交量：
今日的AD = 今日價格波幅 * 成交量
4. 計算累計值
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]
本文翻譯由兄弟財經提供
文章來源：http://www.incrediblecharts.com/indicators/williams_accumulation_distribution.php