def DifferenceInMeans(firsts, others, attr):
"""Compute the difference in means between tables for a given attr.
Prints summary statistics.
"""
firsts_mean = thinkstats.TrimmedMean(getattr(firsts, attr))
print 'First babies, %s, trimmed mean:' % attr, firsts_mean
others_mean = thinkstats.TrimmedMean(getattr(others, attr))
print 'Other babies, %s, trimmed mean:' % attr, others_mean
diff = others_mean - firsts_mean
print 'Difference in means:', diff
print
return diff
def Process(table, name):
"""Runs various analyses on this table."""
first.Process(table)
table.name = name
table.var = thinkstats.Var(table.lengths, table.mu)
table.trim = thinkstats.TrimmedMean(table.lengths)
table.hist = Pmf.MakeHistFromList(table.lengths, name=name)
table.pmf = Pmf.MakePmfFromHist(table.hist)
def Process(table, name):
''' 对数据表进行各种分析处理 '''
practice001.Process(table)
table.name = name
# 计算方差：根据序列、均值
table.var = thinkstats.Var(table.lengths, table.mu)
# 计算切尾均值：根据序列
table.trim = thinkstats.TrimmedMean(table.lengths)
table.hist = Pmf.MakeHistFromList(table.lengths, name=name)
table.pmf = Pmf.MakePmfFromList(table.lengths, name=name)
