What is the MACD Histogram?(MACD 히스토그램이란?) Posted By: Steve Burnson:. The MACD-Histogram quantifies the distance between MACD and its 9-day EMA signal line. The histogram reads positive when MACD is above its 9-day EMA and reads negative when the MACD is below its 9-day EMA. The MACD-Histogram is a technical oscillator that moves both above and below the zero line on its chart. The MACD-Histogra..