Python教程-Python statistics模块

Python statistics模块提供了用于数值数据的数学统计函数。在这个模块中定义了一些常用的统计函数。

mean()函数

mean()函数用于计算列表中数字的算术平均值。

示例

import statistics    
# list of positive integer numbers   
datasets = [5, 2, 7, 4, 2, 6, 8]     
x = statistics.mean(datasets)     
# Printing the mean   
print("Mean is :", x)  

输出：

Mean is : 4.857142857142857

median()函数

median()函数用于返回列表中数值数据的中间值。

示例

import statistics     
datasets = [4, -5, 6, 6, 9, 4, 5, -2]      
# Printing median of the   
# random data-set   
print("Median of data-set is : % s "  
        % (statistics.median(datasets)))  

输出：

Median of data-set is : 4.5

mode()函数

mode()函数返回列表中出现最频繁的数据。

示例

import statistics     
# declaring a simple data-set consisting of real valued positive integers.   
dataset =[2, 4, 7, 7, 2, 2, 3, 6, 6, 8]     
# Printing out the mode of given data-set   
print("Calculated Mode % s" % (statistics.mode(dataset))) 

输出：

Calculated Mode 2

stdev()函数

stdev()函数用于计算列表中给定样本的标准差，样本以列表形式给出。

示例

import statistics     
# creating a simple data - set   
sample = [7, 8, 9, 10, 11]     
# Prints standard deviation   
print("Standard Deviation of sample is % s "   
                % (statistics.stdev(sample)))   

输出：

Standard Deviation of sample is 1.5811388300841898

median_low()函数

median_low()函数用于返回列表中数值数据的低中位数。

示例

import statistics     
# simple list of a set of integers   
set1 = [4, 6, 2, 5, 7, 7]     
# Note: low median will always be a member of the data-set.     
# Print low median of the data-set   
print("Low median of data-set is % s "   
        % (statistics.median_low(set1)))  

输出：

Low median of the data-set is 5

median_high()函数

median_high()函数用于返回列表中数值数据的高中位数。

示例

import statistics     
# list of set of the integers   
dataset = [2, 1, 7, 6, 1, 9]     
print("High median of data-set is %s "   
        % (statistics.median_high(dataset)))  

输出：

High median of the data-set is 6