The average value is calculated by dividing the sum of all data by the number of data.

1 and average introduction:

The average value refers to the sum of all data in a set of data divided by the number of data. The average value is a quantity representing the trend of a set of data sets and an index reflecting the trend of data sets.

The key to solve the problem of average application is to determine the "total amount" and the total number of copies corresponding to the total amount. In statistical work, mean and standard deviation are the two most important measures to describe the trend and deviation of data sets.

2. Advantages of average:

An obvious advantage of the average value is that it can make use of the characteristics of all data and is relatively easy to calculate. In addition, in mathematics, the average value is a statistic that minimizes the sum of squares of errors, that is to say, using the average value to represent data can minimize the secondary loss. Therefore, the average value is a commonly used statistic in mathematics.

3. Disadvantages of the average:

Average also has some disadvantages, precisely because it uses the information of all data, and the average is easily influenced by extreme data. In a unit, if the salary of the manager and deputy manager is particularly high, the average salary of all members of the unit will be high, but in fact, the average salary of everyone except the manager and deputy manager is not very high.

Harmonic mean and exponential mean:

1, harmonic average:

Harmonic average is a kind of average. But statistical harmonic mean is different from mathematical harmonic mean. In mathematics, harmonic average and arithmetic average are independent and self-sufficient. The calculation results are different, and the former is always smaller than the latter.

2. Average index:

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

EXPMA indicator is a trend indicator. Because its calculation formula focuses on the weight of the current price, it can overcome the lag of other index signals to the price trend in use.