pandas:查找给定列的百分位统计信息

问题描述

我有一个 Pandas 数据框 my_df，我可以在其中找到给定列的 mean()、median()、mode():

I have a pandas data frame my_df, where I can find the mean(), median(), mode() of a given column:

my_df['field_A'].mean()
my_df['field_A'].median()
my_df['field_A'].mode()

我想知道是否可以找到更详细的统计数据，例如 90%?谢谢！

I am wondering is it possible to find more detailed stats such as 90 percentile? Thanks!

推荐答案

您可以使用 pandas.DataFrame.quantile() 函数，如下图.

You can use the pandas.DataFrame.quantile() function, as shown below.

import pandas as pd
import random

A = [ random.randint(0,100) for i in range(10) ]
B = [ random.randint(0,100) for i in range(10) ]

df = pd.DataFrame({ 'field_A': A, 'field_B': B })
df
#    field_A  field_B
# 0       90       72
# 1       63       84
# 2       11       74
# 3       61       66
# 4       78       80
# 5       67       75
# 6       89       47
# 7       12       22
# 8       43        5
# 9       30       64

df.field_A.mean()   # Same as df['field_A'].mean()
# 54.399999999999999

df.field_A.median() 
# 62.0

# You can call `quantile(i)` to get the i'th quantile,
# where `i` should be a fractional number.

df.field_A.quantile(0.1) # 10th percentile
# 11.9

df.field_A.quantile(0.5) # same as median
# 62.0

df.field_A.quantile(0.9) # 90th percentile
# 89.10000000000001

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