python筆記：6.3.1獨立樣本均值之差假設檢驗_statsmodels解決方案（例6-7d電池續航時間）

 

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

@author: User
"""

# 《Python數據分析基礎》中國統計出版社

#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 兩獨立樣本均值的t檢驗：")
print(sm.stats.ttest_ind(battery[battery['tech']==1]['Endurance'],
                      battery[battery['tech']==2]['Endurance'],
                      alternative='two-sided',
                      usevar='pooled',
                      value=0))

運行：

 兩獨立樣本均值的t檢驗：
(-2.990826561914063, 0.003872256733972988, 68.0)