9

我正在尝试为时间序列创建一组星期几的箱线图(例如 5 分钟的温度观察)。

我的代码:

# ts is our timeseries
ts = df.SomeColumn

dow_map = {}
days = ['MON','TUE','WED','THU','FRI','SAT','SUN']
dow_idx = ts.index.dayofweek

i = 0
for d in days:
    dow_map[d] = ts[dow_idx == i]
    i = i + 1

df = pd.DataFrame(dow_map)
df.boxplot()

结果是:

---------------------------------------------------------------------------
Exception                                 Traceback (most recent call last)
<ipython-input-898-6070c45e4c4b> in <module>()
     41     i = i + 1
     42 
---> 43 df = pd.DataFrame(dow_map)
     44 df.boxplot()
...
Exception: Reindexing only valid with uniquely valued Index objects

我确实通过为每周的每一天创建数据帧然后将它们连接到最终的数据帧中找到了成功,但这似乎效率低下......

4

2 回答 2

11

第一次创建数据框并使用 weekdays 方法获取星期几:

import pandas as pd
import numpy.random as random
n=1000
df = pd.DataFrame(random.randn(n), pd.date_range('2010-01-01', periods=n), columns=["data"])
df['Dates'] = df.index
df['week_days'] =df.index.weekday
df

现在旋转该表,以便将 week_days 作为列(也可以将 needdays 更改为天的字符串格式,但将其留给您。

x =df.pivot(index='Dates', columns='week_days', values='data')
x.boxplot()

在此处输入图像描述

于 2013-06-21T12:21:05.573 回答
1
import locale, calendar
# for example pl_PL
locale.setlocale(locale.LC_ALL, 'pl_PL.UTF-8')
x = x.rename_axis(lambda x: calendar.day_abbr[x].capitalize())
于 2014-01-02T20:27:16.373 回答