The base for this indicator is the security's price. It takes four steps to get from the actual price to the MACD-Histogram. Talk about massaging the data. While not necessarily a bad thing, chartists should keep this in mind when analyzing the MACD-Histogram. It is an indicator of an indicator. Therefore, it is designed to anticipate signals in MACD, which in turn is designed to identify changes in the price momentum of the underlying security.