MACD Pieces — Lines, Signal, Histogram

The construction

MACD line = 12-EMA minus 26-EMA: the gap between fast and slow trend. Signal line = 9-EMA of the MACD line. Histogram = MACD − signal: the second derivative — how fast the momentum is CHANGING. Gerald Appel's design stacks three lenses on one trend pair.

Reading the three layers

MACD above zero = 12-EMA above 26-EMA = uptrend regime. Crossovers of the signal line = momentum turning within the regime. Histogram slope = acceleration/deceleration — the histogram peaks BEFORE the MACD line peaks, and the MACD peaks before price: a built-in early-warning cascade (with matching lag costs at the slow end).

Where crossovers fail

In chop, MACD whipsaws relentlessly — every wiggle is a "crossover." Its signals are meaningful only when the zero-line REGIME and the crossover agree, and best when divergence (day 23) appears at an extreme. Same hierarchy as RSI: regime first, signal second, confirmation third.

Sources

• MACDInvestopedia
• Technical Analysis: Power Tools for Active InvestorsGerald Appel