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1. Descriptive statistics
1.1 Measurement of location and dispersion
1、描述性统计
1.1测量位置和色散
平均71.72
中位数73.80
变异的83.66
标准偏差9.15
图1：1 / 1 / 2012 / 1 / 2015 / 1的股票价格的计算
如图1所示，均值为71.72，中位数为73.80，方差为83.66，标准差为9.15。宝洁公司（股票代码的符号是）公司的结果是反映从1 / 1 / 2012至1 / 1 / 2015。
均值和中位数的财务含义是指平均值是一个统计术语，它与一系列的中心分布相关联，此外，中间值是中间值，即值将分布分为两半，均值是统计中的重要概念。在统计和概率论中，用中位数来划分一个样本的人口或概率分布为上、下两个部分，这是最常用的衡量价值的中心趋势的指标。这些样本通常包括人口、财务数据的概率。对于一组有限的数字，我们可以观察到所有的高和低的值，找到一个中间的中位数。如果有一个偶数的观测值，通常需要中间值的平均值为中位数。一些最集中的一半的值是小于的中位和一半的值是大于中位数。如果上面和下面的值的值的数目不到一半的浓缩物的数量必须然后几个值等于中位数。对于数量有限的数据，他们的中位数是一个数字：这些数据中的一半是大于它的数据，而另一半的数据是小于它。数有限的数据来计算的中位数是：所有的相同的数据按大小排序。如果数据的数目是奇数的话，那么中间的数据组数据是中间的，如果数据的数目是偶数，则中间的2位数据的算术平均数是在该组的数据。

Mean      71.72 
Median      73.80 
Variance      83.66 
Standard Deviation       9.15 
Figure 1: the calculation of share price from the 1/1/2012 to 1/1/2015
As can be seen in the Figure 1, the mean is 71.72, Median is 73.80, Variance is 83.66 and standard deviation is 9.15. The result of Procter& Gamble (stock symbol is PG) company is reflection from the 1/1/2012 to 1/1/2015.

The financial meaning term of the mean and median is that the mean is a statistical term which is associated with the center of the distribution of a series.In addition, the median is the middle value, i.e. the value splits the distribution into two equal halves.Mean is an important concept in statistics. It is the most common measure of central tendency of value, in order to determine the equilibrium point of a set of data.In statistics and probability theory, the median is used to divide a sample of the population or a probability distribution of values into upper and lower two parts. These samples usually include population, the probability of financial data. For a limited set of numbers, we can observe the value of all the high and low to find a sort of middle of a median. If there is an even number of observations, usually takes the average of the middle two values as the median. A number of the most centralized half the value is less than the median and up to half of the value is greater than the median. If the number of values above and below the median were less than half the number of concentrate must then several values equal to the median. For a limited number of data, they median is a number: these data in half the data is larger than it is, while the other half of the data is smaller than it. A limited number of data to calculate the median is: all of the same data is sorted by size. If the number of data is odd, then the median is the middle of the data group data; if the number of data is an even number, the arithmetic mean of the middle two bits of data is in the group of data.

1.2 Portfolio Statistics

Riskisthevariabilityofthereturnsfromanassetovertime.The standard deviation and the variance of the returns are a measure of the total risk of an asset. If one asset has higher variance than another asset, the former asset is risker than the latter. Since standard deviation is a reflection of the dispersion of a set of measurements of statistical indicators. Refer to the statistical results within a certain time error fluctuations in amplitude. The smaller the standard deviation, the deviation from the average value of less, and vice versa.In p本论文由英语论文网提供整理，提供论文代写，英语论文代写，代写论文，代写英语论文，代写留学生论文，代写英文论文，留学生论文代写相关核心关键词搜索。