Trading Forex in MACD: Moving Average Convergence/Divergence

Trading Forex in MACD: Moving Average Convergence/Divergence
MACD uses exponential moving averages (EMA), which are lagging indicators, to include some trend-following characteristics. These lagging indicators are turned into a momentum oscillator by subtracting the longer period of EMA from the shorter period of EMA. Translating the words into mathemathcis, this is how a MACD calculation looks like:MACD = EMA [shorter period] - EMA[longer period]The resulting plot forms a line that oscillates above and below zero (positive when EMA[shorter] > EMA[longer] and negative whenver EMA[shorter] < EMA[longer]), without any upper or lower limits. MACD is a centered oscillator and the guidelines for using centered oscillators apply. Besides the resulting plot, a standard signal line (or some call it trigger line) is added in the MACD graph for the indication. In maths form, this is how we get the signal line:Signal = EMA [certain period] of MACDGenerally, a 12 day EMA is often userd as the EMA[shorter period]; 26 day EMA for the EMA[longer period]; and 9 day EMA of MACD is used as the signal line. These are the standard figures used by the creator of MACD, Gerald Appel, when the technical indicator first used in 1979. Another popular calculation periods in modern days is 7, 13, 5; where EMA[7] is used for the short period, EMA[13] is used for the long period, and 5 days for EMA of MACD (the signal line).Again, translating words to maths presentation, this is how a standard MACD calculations looks like:MACD = EMA [12] - EMA[26]Signal = EMA [9] of MACD