Python统计模块用法示例

本文概述

• mean()函数
• median()函数
• mode()函数
• stdev()函数
• mid_low()
• mid_high()

Python统计信息模块提供了对数字数据进行数学统计的功能。在此模块中定义了一些流行的统计功能。

mean()函数

mean()函数用于计算列表中数字的算术平均值。

例子

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字数据的中间值。

例子

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()函数返回列表中最常见的数据。

例子

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的标准偏差, 该样本以列表的形式提供。

例子

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

mid_low()

mid_low函数用于返回列表中数字数据的低中位数。

例子

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

mid_high()

mid_high函数用于返回列表中数字数据的高中位数。

例子

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