pyspark.sql.DataFrameStatFunctions.cov

DataFrameStatFunctions.cov(col1, col2)

Calculate the sample covariance for the given columns, specified by their names, as a double value. DataFrame.cov() and DataFrameStatFunctions.cov() are aliases.

New in version 1.4.0.

Changed in version 3.4.0: Supports Spark Connect.

Parameters

col1str

The name of the first column

col2str

The name of the second column

Returns

float

Covariance of two columns.

Examples

>>> df = spark.createDataFrame([(1, 12), (10, 1), (19, 8)], ["c1", "c2"])
>>> df.cov("c1", "c2")
-18.0
>>> df = spark.createDataFrame([(11, 12), (10, 11), (9, 10)], ["small", "bigger"])
>>> df.cov("small", "bigger")
1.0