Pastaba.
Prieigai prie šio puslapio reikalingas įgaliojimas. Galite bandyti prisijungti arba pakeisti katalogus.
Prieigai prie šio puslapio reikalingas įgaliojimas. Galite bandyti pakeisti katalogus.
Calculates the sample covariance for the given columns, specified by their names, as a double value. DataFrame.cov and DataFrameStatFunctions.cov are aliases of each other.
Syntax
cov(col1, col2)
Parameters
| Parameter | Type | Description |
|---|---|---|
col1 |
str | The name of the first column. |
col2 |
str | The name of the second column. |
Returns
float
Examples
df = spark.createDataFrame([(1, 12), (10, 1), (19, 8)], ["c1", "c2"])
df.stat.cov("c1", "c2")
# -18.0
df = spark.createDataFrame([(11, 12), (10, 11), (9, 10)], ["small", "bigger"])
df.stat.cov("small", "bigger")
# 1.0