Moving average发表评论(0)编辑词条

In statistics, a moving average, also called rolling average, rolling mean or running average, is a type of finite impulse response filter used to analyze a set of data points by creating a series of averages of different subsets of the full data set.

Given a series of numbers and a fixed subset size, the moving average can be obtained by first taking the average of the first subset. The fixed subset size is then shifted forward, creating a new subset of numbers, which is averaged. This process is repeated over the entire data series. The plot line connecting all the (fixed) averages is the moving average. Thus, a moving average is not a single number, but it is a set of numbers, each of which is the average of the corresponding subset of a larger set of data points. A moving average may also use unequal weights for each data value in the subset to emphasize particular values in the subset.

A moving average is commonly used with time series data to smooth out short-term fluctuations and highlight longer-term trends or cycles. The threshold between short-term and long-term depends on the application, and the parameters of the moving average will be set accordingly. For example, it is often used in technical analysis of financial data, like stock prices, returns or trading volumes. It is also used in economics to examine gross domestic product, employment or other macroeconomic time series. Mathematically, a moving average is a type of convolution and so it is also similar to the low-pass filter used in signal processing. When used with non-time series data, a moving average simply acts as a generic smoothing operation without any specific connection to time, although typically some kind of ordering is implied.

MA（Moving average），移动平均线。

移动平均线(MA)计算方法就是求连续若干天的收盘价的算术平均。天数就是MA的参数。10日的移动平均线常简称为10日线{MA（10）}
移动平均线的特点　

MA的最基本的思想是消除偶然因素的影响，另外还稍微有一点平均成本价格的涵义。它具有以下几个特点。　

(1)追踪趋势。注意价格的趋势，并追随这个趋势，不轻易放弃。如果从股价的图表中能够找出上升或下降趋势线，那么，MA的曲线将保持与趋势线方向一致，能消除中间股价在这个过程中出现的起伏。原始数据的股价图表不具备这个保持追踪趋势的特性。　

(2)滞后性。在股价原有趋势发生反转时，由于MA的追踪趋势的特性，MA的行动往往过于迟缓，调头速度落后于大趋势。这是MA的一个极大的弱点。等MA发出反转信号时，股价调头的深度已经很大了。　

(3)稳定性。由于MA的计算方法就可知道，要比较大地改变MA的数值，无论是向上还是向下，都比较困难，必须是当天的股价有很大的变动。因为MA的变动不是一天的变动，而是几天的变动，一天的大变动被几天一分摊，变动就会变小而显不出来。这种稳定性有优点，也有缺点，在应用时应多加注意，掌握好分寸。　

(4)助涨助跌性。当股价突破了MA时，无论是向上突破还是向下突破，股价有继续向突破方面再走一程的愿望，这就是MA的助涨助跌性。　

(5)支撑线和压力线的特性。由于MA的上述四个特性。使得它在股价走势中起支撑线和压力线的作用。