CONTINUING WITH MACD
Dear friends,
Karthik has given a lucid and easy to understand description of MACD and its use as a trading system. He has given the rules for trading and reinforced our understanding with very informative charts and comments. As he is very busy he probably could not cover some more aspects of MACD for want of time. Even then whatever he has described is quite sufficient for understanding and experimenting with MACD.
I would like to continue this series with a couple of posts (may be three or four) describing the additional strength that MACD can give to an existing trading system to make it more robust. I will also discuss about the "Zero-Lag MACD". My contribution will not be as lengthy as Karthik's because I do not have as much experience as Karthik has. But I will write about whatever little I know. Karthik and other knowledgeable members can add their comments so that it would be more useful to all of us.
Any charts that I upload will have continuation of Karthik's chart numbers to retain the continuity with his posts.
To start with I will summarize whatever Karthik has posted. Some of the points below may be repetition of what he has posted and some are those which he has not mentioned explicitly. This will maintain the continuity.
MACD and MACD Histogram in a nutshell:
MACD was developed by Gerald Appel.
It depicts both momentum and trend in one indicator. As a trend-following indicator, it will not be wrong for very long. As a momentum indicator, MACD foreshadows the changes in the price.
MACD represents the convergence and divergence of two moving averages.
MACD can be applied to all time frames: intra day, daily, weekly or monthly charts.
The default setting for MACD is the difference between the 12 and 26 period EMA. For weekly charts, shorter periods of moving averages may be appropriate. For volatile stocks, slower moving averages (longer periods) help smooth the data.
A 9-period EMA of the MACD is used as "Signal Line" which is also known as "Trigger Line."
MACD HISTOGRAM:
In 1986, Thomas Aspray developed the MACD Histogram.
The MACD-Histogram represents the difference between MACD and the signal line. This difference is presented as a histogram, making zeroline crossovers and divergences easily identifiable.
Sharp increase in the MACD-Histogram means bullish momentum is becoming stronger. Similarly, sharp declines in the MACD Histogram indicate that bearish momentum is increasing.
MACD-Histogram does not show the absolute value of MACD. It shows the value of MACD relative to its Signal Line. Usually, a divergence in MACD-Histogram is observed before the corresponding move in MACD.
The main signal given by the MACD-Histogram is a divergence before a moving average crossover. In general, there are two types of divergences: the slant divergence and the peak-trough divergence.
A slant divergence is a continuous and relatively smooth move in one direction, either up or down. Slant divergences generally cover a shorter time period.
A peak-trough divergence occurs when two or more peaks (or troughs) develop in one direction to form the divergence. A series of two or more rising troughs (higher lows) form a positive divergence and a series of two or more declining peaks (lower highs) form a negative divergence. Peak-trough divergences usually cover a longer time period than slant divergences. They are also more reliable than the slant divergences.
The longer and sharper the divergence the better the signal will be. Short and shallow divergences can lead to false signals and whipsaws.
The important aspect of the MACD-Histogram is its ability to anticipate MACD signals. Divergences can usually be spotted in the MACD-Histogram before MACD moving average crossovers.
Multiple time-frame MACD charts are useful in validating the inferences. For example, the weekly MACD can be used along with daily MACD. The weekly MACD shows the long-term trend. Then only MACD signals on Daily chart that agree with the long-term trend would be considered valid. Thus if the long term trend is bullish, only negative divergences with bearish zeroline crossovers are considered valid. If the long-term trend is bearish, only positive divergences with bullish zeroline crossovers are considered valid.
Similarly, daily MACD can be used as trend indicator and intra day trades taken with intra day MACD.
One should be careful about small and shallow divergences. These may sometimes lead to good signals, but they are also more prone to create false signals.
In the next post I will write about use of MACD to improve an existing trading set-up.
Regards
-Anant