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2010.01.08 12:02
Indicators

Average Directional Movement Index Wilder - indicator for MetaTrader 5

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Average Directional Movement Index Wilder (ADX Wilder) helps to determine if there is a market trend.

This technical indicator is constructed as a strict correspondence with the algorithm described by Welles Wilder in his book "New concepts in technical trading systems".

Trading rules of this indicator are described in the Average Directional Movement Index.

Calculation:

First positive (dm_plus) and negative (dm_minus) changes at each bar are calculated, as well as the true range tr:

If High(i) - High(i-1) > 0  dm_plus(i) = High[(i) - High(i-1), otherwise dm_plus(i) = 0.

If Low(i-1) - Low(i) > 0  dm_minus(i) = Low(i-1) - Low(i), otherwise dm_minus(i) = 0.

tr(i) = Max(ABS(High(i) - Low(i)), ABS(High(i) - Close(i-1)), ABS(Low(i) - Close(i-1)))

where:

  • High(i) - maximum price of the current bar;
  • Low(i) - minimum price of the current bar;
  • High(i-1) - maximum price of the previous bar;
  • Low(i-1) - minimum price of the previous bar;
  • Close(i-1) - close price of the previous bar;
  • Max (a, b , c) - maximum value out of three numbers: a, b и c;
  • ABS(X)  - absolute value of the X.

After that the smoothed values are calculated: Plus_D(i), Minus_D(i) and ATR():

ATR(i) = SMMA(tr, Period_ADX,i)
Plus_D(i) = SMMA(dm_plus, Period_ADX,i)/ATR(i)*100
Minus_D(i) = SMMA(dm_minus, Period_ADX,i)/ATR(i)*100

where:


  • SMMA(X, N, i) - Smoothed Moving Average of X series on the current bar;
  • Perod_ADX - number of bars, used for calculation.

Now Directional Movement Index - DX(i) - is calculated:

DX(i) = ABS(Plus_D(i) - Minus_D(i))/(Plus_D(i) + Minus_D(i)) * 100

After preliminary calculations we obtain the value of the ADX(i) indicator on the current bar by smoothing DX index values:

ADX(i) = SMMA(DX, Perod_ADX, i)

Translated from Russian by MetaQuotes Software Corp.
Original code: https://www.mql5.com/ru/code/8

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