python笔记：6.3.1独立样本均值之差假设检验_statsmodels解决方案（例6-7d电池续航时间）

 

# -*- coding: utf-8 -*-
"""
Created on Fri Jun 21 09:21:07 2019

@author: User
"""

# 《Python数据分析基础》中国统计出版社

#import numpy as np
from scipy import stats
import pandas as pd
import statsmodels.api as sm

battery = pd.read_csv(u'data\\ch6\\battery.csv',encoding = "gbk")
print(battery.head())

print("\n 两独立样本均值的t检验：")
print(sm.stats.ttest_ind(battery[battery['tech']==1]['Endurance'],
                      battery[battery['tech']==2]['Endurance'],
                      alternative='two-sided',
                      usevar='pooled',
                      value=0))

运行：

 两独立样本均值的t检验：
(-2.990826561914063, 0.003872256733972988, 68.0)