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Pandas DataFrame | corrwith method

schedule Aug 12, 2023
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Pandas DataFrame.corrwith(~) computes the pairwise correlation between the columns or rows of the source DataFrame and the given Series or DataFrame.

WARNING

corrwith(~) will only compute the correlation of columns or rows where the column labels or row labels align. Otherwise, a column or row filled with NaN will be returned.

Note that the unbiased estimator of the correlation is computed:

$$\mathrm{cov}(\mathbf{x},\mathbf{y})=\frac{1}{N-1}\sum_{i=0}^{N-1}\left[\left(x_i-\bar{x}\right)(y_i-\bar{y})\right]$$

Parameters

1. other | Series or DataFrame

The Series or DataFrame with which to compute the correlation.

2. axis | int or string | optional

Whether to compute the correlation of rows or columns:

Axis

Description

0 or "index"

Compute the correlation between columns.

1 or "columns"

Compute the correlation between rows.

By default, axis=0.

3. drop | boolean | optional

Whether or not to remove rows or columns that are not present in both the source DataFrame and other. By default, drop=False.

4. method | string or callable | optional

The type of correlation coefficient to compute:

Value

Description

"pearson"

Compute the standard correlation coefficient.

"kendall"

Compute the Kendall Tau correlation coefficient.

"spearman"

Compute the Spearman rank correlation.

callable

A function that takes in as argument two 1D Numpy arrays and returns a single float. The matrix that is returned will always be symmetric and have 1 filled along the main diagonal.

Return Value

A Series holding the pairwise correlation between the columns or rows of the source DataFrame and other.

Examples

Basic usage

Consider the following DataFrames:

 df = pd.DataFrame({"A":[2,4,6], "B":[3,4,5]})df_other = pd.DataFrame({"A":[6,2,3],"C":[1,2,3]}) A B | A C0 2 3 | 0 6 11 4 4 | 1 2 22 6 5 | 2 3 3 

Computing the correlation of df and df_other:

 df.corrwith(df_other) A -0.720577B NaNC NaNdtype: float64 

Notice how only the correlation for the pair of column A, which existed in both DataFrames, was computed.

Specifying drop

To remove row or column labels that do not match up, set drop=True:

 df.corrwith(df_other, drop=True) A -0.720577dtype: float64 
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