pandas 带有熊猫和 groupby 的箱线图
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Boxplot with pandas and groupby
提问by nicholas.reichel
I have the following dataset sample:
我有以下数据集样本：
0 1
0 0 0.040158
1 2 0.500642
2 0 0.005694
3 1 0.065052
4 0 0.034789
5 2 0.128495
6 1 0.088816
7 1 0.056725
8 0 -0.000193
9 2 -0.070252
10 2 0.138282
11 2 0.054638
12 2 0.039994
13 2 0.060659
14 0 0.038562
And need a box and whisker plot, grouped by column 0. I have the following:
并且需要一个盒须图，按第 0 列分组。我有以下内容：
plt.figure()
grouped = df.groupby(0)
grouped.boxplot(column=1)
plt.savefig('plot.png')
But I end up with three subplots. How can place all three on one plot?
Thanks.
但我最终得到了三个子图。如何将所有三个放在一个地块上？谢谢。
采纳答案by Alexander
I don't believe you need to use groupby.
我不相信你需要使用 groupby。
df2 = df.pivot(columns=df.columns[0], index=df.index)
df2.columns = df2.columns.droplevel()
>>> df2
0 0 1 2
0 0.040158 NaN NaN
1 NaN NaN 0.500642
2 0.005694 NaN NaN
3 NaN 0.065052 NaN
4 0.034789 NaN NaN
5 NaN NaN 0.128495
6 NaN 0.088816 NaN
7 NaN 0.056725 NaN
8 -0.000193 NaN NaN
9 NaN NaN -0.070252
10 NaN NaN 0.138282
11 NaN NaN 0.054638
12 NaN NaN 0.039994
13 NaN NaN 0.060659
14 0.038562 NaN NaN
df2.boxplot()
回答by fixxxer
In 0.16.0 version of pandas, you could simply do this:
在 0.16.0 版本的 pandas 中，您可以简单地执行以下操作：
df.boxplot(by='0')
Result:
结果：
