The moving average (MA) is a technical analysis method based on the concept of "average cost" of Dow Jones and the principle of "moving average" in statistics. It connects the average stock price in a period of time into a curve to show the historical fluctuation of the stock price and then reflect the future development trend of the stock price index. It is an intuitive expression of Dow's theory.

Definition of moving average: "average" refers to the arithmetic average of the closing price in the last n days; "Moving" means that we always use the price data of the last n days in our calculations. Therefore, the average array (the closing price of the last n days) moves forward day by day with the change of the new trading day. When we calculate the moving average, we usually use the closing price of the last n days.

Add the new closing price to the array day by day, and the closing price of n+ 1 from bottom to front is deleted. Then, divide the new sum by n, and you will get the new day's average (n-day average).