我正在努力实现以下目标:
我有一个数据帧,它有许多列,其中包含度量和一些维度,如country
、device
、name
。这3个维度a中的每一个都有一些唯一的值,我在使用pd.corr()
之前使用这些值来过滤数据。
为了演示,我将使用titanic数据集。
import seaborn as sns
df_test = sns.load_dataset('titanic')
for who in df_test['who'].unique():
for where in df_test['embark_town'].unique():
print(df_test[(df_test['who']==who)&(df_test['embark_town']==where)].corr())
从而产生df_test['who'].nunique()*df_test['embark_town'].nunique()
、9
不同的pd.corr()
相关性。
以下示例:
survived pclass age sibsp parch fare
survived 1.000000 -0.198092 0.062199 -0.046691 -0.071417 0.108706
pclass -0.198092 1.000000 -0.438377 0.008843 -0.015523 -0.485546
age 0.062199 -0.438377 1.000000 -0.049317 0.077529 0.199062
sibsp -0.046691 0.008843 -0.049317 1.000000 0.464033 0.358680
parch -0.071417 -0.015523 0.077529 0.464033 1.000000 0.415207
fare 0.108706 -0.485546 0.199062 0.358680 0.415207 1.000000
adult_male NaN NaN NaN NaN NaN NaN
alone 0.030464 0.133638 -0.022396 -0.629845 -0.506964 -0.411392
我正试图获得能回答这个问题的数据:
在我的设置中,每个变量之间的相关性最高/最低,输出可能是list
、dict
、df
,类似于:
output = {'highest_corr_survived_p_class':['who = man', 'embark_town = Southampton', 0.65],
'lowest_corr_survived_p_class':['who = man', 'embark_town = Cherbourg',-0.32],
'highest_corr_survived_age':['who = female', 'embark_town = Cherbourg',0.75],
'lowest_corr_survived_age':['who = man', 'embark_town = Cherbourg',-0.3]
...
'lowest_corr_alone_fare':['who = man', 'embark_town = Cherbourg',-0.7]}
我陷入困境的地方是找到一种创建这些数据的好方法,以及如何将其放置在df
中。
我尝试过的:
output = {}
for who in df_test['who'].dropna().unique():
for where in df_test['embark_town'].dropna().unique():
output[f'{who}_{where}_corr'] = df_test[(df_test['who']==who)&(df_test['embark_town']==where)].corr().loc['survived','pclass']
哪个产生output
:
{'man_Southampton_corr': -0.19809207465001574,
'man_Cherbourg_corr': -0.2102998217386208,
'man_Queenstown_corr': 0.06717166132798494,
'woman_Southampton_corr': -0.5525868192717193,
'woman_Cherbourg_corr': -0.5549942419871897,
'woman_Queenstown_corr': -0.16896381511084563,
'child_Southampton_corr': -0.5086941796202842,
'child_Cherbourg_corr': -0.2390457218668788,
'child_Queenstown_corr': nan}
这种方法不关心什么是max
或min
相关性,这是我的目标。
我不确定如何使用loc[]
在列之间添加所有可能的变体,或者有更好/更容易的方法将所有内容放入df
中吗?
您可以将DataFrameGroupBy.corr
与DataFrame.stack
一起使用,删除1
和-1
行,并通过CCD_ 21,DataFrameGroupBy.idxmin
表示索引,Series.loc
表示选择,通过concat
连接在一起,最后使用字典理解为dict
:
import seaborn as sns
df_test = sns.load_dataset('titanic')
# print (df_test)
s = df_test.groupby(['who','embark_town']).corr().stack()
s = s[~s.isin([1, -1])]
s = (pd.concat([s.loc[s.groupby(level=[2,3]).idxmax()],
s.loc[s.groupby(level=[2,3]).idxmin()]], keys=('highest','lowest'))
.sort_index(level=[3,4], sort_remaining=False))
print (s)
who embark_town
highest child Queenstown age alone 0.877346
lowest woman Queenstown age alone -0.767493
highest woman Queenstown age fare 0.520461
lowest child Queenstown age fare -0.877346
highest woman Queenstown age parch 0.633627
lowest woman Queenstown survived parch -0.433029
highest man Queenstown survived pclass 0.067172
lowest woman Cherbourg survived pclass -0.554994
highest man Queenstown survived sibsp 0.232685
lowest child Southampton survived sibsp -0.692578
Length: 84, dtype: float64
output = {f'{k[0]}_corr_{k[3]}_{k[4]}':
[f'who = {k[1]}', f'embark_town = {k[2]}',v] for k, v in s.items()}
print(output)
编辑:对于TOP3和BOTTOM3,可以排序并使用GroupBy.head
和GroupBy.tail
:
import seaborn as sns
df_test = sns.load_dataset('titanic')
# print (df_test)
s = df_test.groupby(['who','embark_town']).corr().stack()
s = s[~s.isin([1, -1])].sort_values()
s = (pd.concat([s.groupby(level=[2,3]).head(3),
s.groupby(level=[2,3]).tail(3)], keys=('highest','lowest'))
.sort_index(level=[3,4], sort_remaining=False)
)
print (s)
who embark_town
highest woman Queenstown age alone -0.767493
Cherbourg age alone -0.073881
man Queenstown age alone -0.069001
lowest child Southampton age alone 0.169244
Cherbourg age alone 0.361780
highest woman Southampton survived sibsp -0.252524
man Southampton survived sibsp -0.046691
lowest man Cherbourg survived sibsp 0.125276
woman Queenstown survived sibsp 0.143025
man Queenstown survived sibsp 0.232685
Length: 252, dtype: float64