EXPMA= (closing price of the current day or period-EXPMA of the previous day or period)/n+expma of the previous day or period, where the first expma value of the previous period is the closing price of the previous period, and n is the number of days.

EXPMA (Expma) is based on the arithmetic average of the closing price of silver, and is analyzed according to the calculation results to judge the future price trend.

From the statistical point of view, as long as the moving average line (MA) is drawn at the midpoint of the price time span, the price movement trend can be correctly reflected, but this will cause the signal to lag in time, and EXPMA index is the compensation for the moving average line. EXPMA index can overcome the lag line of other MACD index signals to the price trend because its calculation formula focuses on the weight of the price of the day (current period). At the same time, it also eliminates the signal lead of DMA index to price trend at a certain moment, which is a very effective analysis index.