A weakness of moving averages is that they lag the market, so they do not necessarily signal a change in trends. To address this issue, using a shorter period, such as 5 or 10 day moving average, would be more reflective of the recent price action than the 40 or 150-day moving averages.
Alternatively, moving averages may be used by combining two averages of distinct time- frames. Whether using 5 and 20-day MA, or 40 and 150-day MA, buy signals are usually detected when the shorter-term average crosses above the longer-term average, i.e. price will likely go up. Conversely, sell signals are suggested when the shorter average falls below the longer one, i.e. price will likely go down.
There are three kind of mathematically distinct moving averages: Simple MA; Linearly Weighted MA; and Exponentially Smoothed. The latter choice is the preferred one because it assigns greater weight for the most recent data, and considers data in the entire life of the instrument making of it a more accurate indicator.
MACD: Moving Average Convergence Divergence: MACD is a more detailed method of using moving averages to find trading signals from price charts. Developed by Gerald Appel, the MACD plots the difference between a 26-day exponential moving average and a 12-day exponential moving average. A 9- day moving average is generally used as a trigger line, meaning when the MACD crosses below this trigger it is a bearish signal and when it crosses above it, it’s a bullish signal, with the corresponding implications for the currency’s price in each particular situation.
As with other studies, traders will look to MACD studies to provide early signals or divergences between market prices and a technical indicator. If the MACD turns positive and makes higher lows while prices are still tanking, this could be a strong buy signal. Conversely, if the MACD makes lower highs while prices are making new highs, this could be a strong bearish divergence and a sell signal.
About the author:
Adrian Pablo; Forex traderand freelance writer.