配对样本t检验

import pandas as pd
from scipy import stats

url = 'https://liangdaima.com/static/data/ds/download_festival.csv'
df = pd.read_csv(url)
day1 = df['day_1'].dropna()
day3 = df['day_3'].dropna()
min_len = min(len(day1), len(day3))
t_stat, p_value = stats.ttest_rel(day1[:min_len], day3[:min_len])
print(f'{t_stat:.4f}')