# -*- coding: utf-8 -*-
"""
Created on Thu Jun 20 16:15:16 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
mobile = pd.read_csv(u'data\\ch6\mobile.csv',encoding = "gbk")
print(mobile.head())
'''
alternative:備擇假設符號,缺省表示默認符號爲等號,其值爲two-sided
下面運行結果,
第一個值爲根據樣本數據計算的統計量,
第二個值爲該統計量對應的P值 0.75>>0.05,說明在顯著性水平0.05條件下,
沒有充分證據表明應當拒絕原假設
'''
print(sm.stats.DescrStatsW(mobile['csi']).ttest_mean(value=82,
alternative='larger'))
運行:
(-0.6859943405700328, 0.7503546857532633, 24.0)