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The moving average convergence divergence is a technical indicator used to assess the power of price movement in a market. The MACD series is the difference between a "fast" (short period) exponential moving average (EMA), and a "slow" (longer period) EMA of the price series. The average series is an EMA of the MACD series itself. The MACD indicator thus depends on three time parameters, namely the time constants of the three EMAs. MACD full form is Moving Average Convergence Divergence. Gerald Appel developed the MACD in the late 1970s. It is a momentum-based tool for tracking market trends. It analyses the interaction... MACD is a momentum oscillator that shows the difference between two exponential moving averages. It can be used to trade trends, identify divergence, and signal crossovers. Learn how to calculate and use MACD with Fidelity.