該指標適用于MT4和MT5.

值域擴張指數 (MetaTrader 指標) 是一種相對振蕩指標，用以測量價格變化的步伐并通過價格的弱強發出超買/超賣狀態的信號。該指標由Tom DeMark創建，并在其著作The New Science of Technical Analysis中有相關闡釋。

該指標的值域變化為-100到+100。REI是一種加強版的振蕩指標，因為只有當出現重要的峰值或底部時，它才會發出信號。。

輸入參數：

REI_Period (默認 = 8) — 指標的時段。增加該數值則會發出更少但更精確的信號。減小該數值則會發出更多但不準確的信號。不建議更改此參數。

Tom DeMark 建議默認時段使用8。當價格升至60以上且價格下跌位于其下方時，發出看跌信號。當價格跌至-60以下且價格上漲位于其上方時，發出看漲信號。我測試發現該指標相當不準確（像所有振蕩指標一樣），但是應用于較短的時間框架下還是非常有用的。

標簽:MT4 MT5指標

MT4源碼：
//+------------------------------------------------------------------+ //| RangeExpansionIndex.mq4 | //| Copyright ? 2010, EarnForex.com | //| http://www.weiqiv.net.cn/ | //+------------------------------------------------------------------+ #property copyright "Copyright ? 2010, EarnForex.com" #property link "http://www.weiqiv.net.cn" /* Calculates Tom DeMark's Range Expansion Index. Going above 60 and then dropping below 60 signals price weakness. Going below -60 and the rising above -60 signals price strength. For more info see The New Science of Technical Analysis. */ #property indicator_separate_window #property indicator_buffers 1 #property indicator_color1 Blue #property indicator_width1 1 #property indicator_style1 STYLE_SOLID #property indicator_level1 60 #property indicator_level2 -60 extern int REI_Period = 8; // Buffers double REI[]; //+------------------------------------------------------------------+ //| Custom indicator initialization function | //+------------------------------------------------------------------+ int init() { IndicatorBuffers(1); IndicatorShortName("REI (" + REI_Period + ")"); SetIndexBuffer(0, REI); SetIndexStyle(0, DRAW_LINE); SetIndexDrawBegin(0, REI_Period + 8); return(0); } //+------------------------------------------------------------------+ //| Range Expansion Index | //+------------------------------------------------------------------+ int start() { if (Bars <= 8 + REI_Period) return(0); int counted_bars = IndicatorCounted(); if (counted_bars > 0) counted_bars--; int limit = Bars - counted_bars; for(int i = 0; i <= limit; i++) { double SubValueSum = 0; double AbsDailyValueSum = 0; for(int j = 0; j < REI_Period; j++) { SubValueSum += SubValue(i + j); AbsDailyValueSum += AbsDailyValue(i + j); } if (AbsDailyValueSum != 0) REI[i] = SubValueSum / AbsDailyValueSum * 100; else REI[i] = 0; } return(0); } //+------------------------------------------------------------------+ //| Calculate the Conditional Value | //+------------------------------------------------------------------+ double SubValue(int i) { double diff1 = High[i] - High[i + 2]; double diff2 = Low[i] - Low[i + 2]; int num_zero1, num_zero2; if ((High[i + 2] < Close[i + 7]) && (High[i + 2] < Close[i + 8]) && (High[i] < High[i + 5]) && (High[i] < High[i + 6])) num_zero1 = 0; else num_zero1 = 1; if ((Low[i + 2] > Close[i + 7]) && (Low[i + 2] > Close[i + 8]) && (Low[i] > Low[i + 5]) && (Low[i] > Low[i + 6])) num_zero2 = 0; else num_zero2 = 1; return(num_zero1 * num_zero2 * (diff1 + diff2)); } //+------------------------------------------------------------------+ //| Calculate the Absolute Value | //+------------------------------------------------------------------+ double AbsDailyValue(int i = 0) { double diff1 = MathAbs(High[i] - High[i + 2]); double diff2 = MathAbs(Low[i] - Low[i + 2]); return(diff1 + diff2); } //+------------------------------------------------------------------+
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MT5源碼：//+------------------------------------------------------------------+ //| RangeExpansionIndex.mq5 | //| Copyright ? 2010, EarnForex.com | //| http://www.weiqiv.net.cn/ | //+------------------------------------------------------------------+ #property copyright "Copyright ? 2010, EarnForex.com" #property link "http://www.weiqiv.net.cn" #property version "1.0" #property description "Calculates Tom DeMark's Range Expansion Index." #property description "Going above 60 and then dropping below 60 signals price weakness." #property description "Going below -60 and the rising above -60 signals price strength." #property description "For more info see The New Science of Technical Analysis." #property indicator_separate_window #property indicator_buffers 1 #property indicator_plots 1 #property indicator_width1 1 #property indicator_color1 Blue #property indicator_type1 DRAW_LINE #property indicator_style1 STYLE_SOLID #property indicator_level1 60 #property indicator_level2 -60 input int REI_Period = 8; // Buffers double REI[]; //+------------------------------------------------------------------+ //| Custom indicator initialization function | //+------------------------------------------------------------------+ void OnInit() { IndicatorSetString(INDICATOR_SHORTNAME, "REI(" + IntegerToString(REI_Period) + ")"); IndicatorSetInteger(INDICATOR_DIGITS, 2); SetIndexBuffer(0, REI, INDICATOR_DATA); } //+------------------------------------------------------------------+ //| Range Expansion Index | //+------------------------------------------------------------------+ int OnCalculate(const int rates_total, const int prev_calculated, const datetime &time[], const double &open[], const double &High[], const double &Low[], const double &Close[], const long &tick_volume[], const long &volume[], const int &spread[]) { int limit; // Too few bars to do anything if (rates_total <= REI_Period + 8) return(0); // If we don't have enough bars to count as specified in the input int counted_bars = prev_calculated; if (counted_bars < 8 + REI_Period) limit = 8 + REI_Period; else limit = rates_total - 1; for (int i = rates_total - 1; i >= limit; i--) { double SubValueSum = 0; double AbsDailyValueSum = 0; for (int j = 0; j < REI_Period; j++) { SubValueSum += SubValue(i - j, High, Low, Close); AbsDailyValueSum += AbsDailyValue(i - j, High, Low, Close); } if (AbsDailyValueSum != 0) REI[i] = SubValueSum / AbsDailyValueSum * 100; else REI[i] = 0; } return(rates_total); } //+------------------------------------------------------------------+ //| Calculate the Conditional Value | //+------------------------------------------------------------------+ double SubValue(const int i, const double &High[], const double &Low[], const double &Close[]) { int num_zero1, num_zero2; double diff1 = High[i] - High[i - 2]; double diff2 = Low[i] - Low[i - 2]; if ((High[i - 2] < Close[i - 7]) && (High[i - 2] < Close[i - 8]) && (High[i] < High[i - 5]) && (High[i] < High[i-6])) num_zero1 = 0; else num_zero1 = 1; if ((Low[i - 2] > Close[i - 7]) && (Low[i - 2] > Close[i - 8]) && (Low[i] > Low[i - 5]) && (Low[i] > Low[i - 6])) num_zero2 = 0; else num_zero2 = 1; return (num_zero1 * num_zero2 * (diff1 + diff2)); } //+------------------------------------------------------------------+ //| Calculate the Absolute Value | //+------------------------------------------------------------------+ double AbsDailyValue(const int i, const double &High[], const double &Low[], const double &Close[]) { double diff1 = MathAbs(High[i] - High[i - 2]); double diff2 = MathAbs(Low[i] - Low[i - 2]); return (diff1 + diff2); } //+------------------------------------------------------------------+
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