python筆記：6.3.1獨立樣本均值之差假設檢驗_對技術人員的估計進行檢驗（例6-8電池續航時間）

 

# -*- coding: utf-8 -*-
"""
Created on Fri Jun 21 11:00:34 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 對總體均值的差值進行檢驗：")
print(sm.stats.ttest_ind(battery[battery['tech']==1]['Endurance'],
                      battery[battery['tech']==2]['Endurance'],
                      alternative='smaller',
                      usevar='pooled',
                      value=0.1))

運行：

 對總體均值的差值進行檢驗：
(-4.153925780436198, 4.666612694433634e-05, 68.0)