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pythonpandasscipysklearn-pandaspearson-correlation
Kyle
Kyle

Reputation: 387

python scipy spearman correlations

I am trying to obtain the column names from the dataframe (df) and associate them to the resulting array produced by the spearmanr correlation function. I need to associate both the column names (a-j) back to the correlation value (spearman) and the p-values (spearman_pvalue). Is there an intuitive way to perform this task?

from scipy.stats import pearsonr,spearmanr
import numpy as np
import pandas as pd

df=pd.DataFrame(np.random.randint(0,100,size= (100,10)),columns=list('abcdefghij'))

def binary(row):
    if row>=50:
        return 1
    else:
        return 0
df['target']=df.a.apply(binary)

spearman,spearman_pvalue=spearmanr(df.drop(['target'],axis=1),df.target)
print(spearman)
print(spearman_pvalue)

Upvotes: 4

Views: 1584

Answers (1)

jezrael
jezrael

Reputation: 863301

It seems you need:

from scipy.stats import spearmanr

df=pd.DataFrame(np.random.randint(0,100,size= (100,10)),columns=list('abcdefghij'))
#print (df)

#faster for binary df
df['target'] = (df['a'] >= 50).astype(int)
#print (df)

spearman,spearman_pvalue=spearmanr(df.drop(['target'],axis=1),df.target)

df1 = pd.DataFrame(spearman.reshape(-1, 11), columns=df.columns)
#print (df1)

df2 = pd.DataFrame(spearman_pvalue.reshape(-1, 11), columns=df.columns)
#print (df2)

### Kyle, we can assign the index back to the column names for the total matrix:
df2=df2.set_index(df.columns)
df1=df1.set_index(df.columns)

Or:

df1 = pd.DataFrame(spearman.reshape(-1, 11), 
                  columns=df.columns, 
                  index=df.columns)
df2 = pd.DataFrame(spearman_pvalue.reshape(-1, 11), 
                   columns=df.columns, 
                   index=df.columns)

Upvotes: 3

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