摘要：import pandas as pd import numpy as np import matplotlib.pyplot as plt import datetime from dateutil.parser import parse import seaborn as sns %matplo 阅读全文

摘要：一个参数的估计 估计均值 def mean_interval(mean=None,std=None,n=None,confidence=0.95): """ """ alpha=1-confidence z_score=ss.norm.isf(alpha/2) me=z_score*std/np.s 阅读全文