Python statistics统计模块|极客笔记

Python statistics统计模块

Python统计模块提供了计算数值数据的数学统计函数。此模块中定义了一些流行的统计函数。

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()函数用于计算给定样本（以列表形式给出）的标准差。

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()

中位数低（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()

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：