SparkR (version 2.4.6)

cov: cov

Description

Compute the covariance between two expressions.

Usage

cov(x, ...)
covar_samp(col1, col2)
covar_pop(col1, col2)
# S4 method for characterOrColumn
cov(x, col2)
# S4 method for characterOrColumn,characterOrColumn
covar_samp(col1, col2)
# S4 method for characterOrColumn,characterOrColumn
covar_pop(col1, col2)
# S4 method for SparkDataFrame
cov(x, colName1, colName2)

Arguments

x

a Column or a SparkDataFrame.

...

additional argument(s). If x is a Column, a Column should be provided. If x is a SparkDataFrame, two column names should be provided.

col1

the first Column.

col2

the second Column.

colName1

the name of the first column

colName2

the name of the second column

Value

The covariance of the two columns.

Details

cov: Compute the sample covariance between two expressions.

covar_sample: Alias for cov.

covar_pop: Computes the population covariance between two expressions.

cov: When applied to SparkDataFrame, this calculates the sample covariance of two numerical columns of one SparkDataFrame.

See Also

Other aggregate functions: avg(), column_aggregate_functions, corr(), count(), first(), last()

Other stat functions: approxQuantile(), corr(), crosstab(), freqItems(), sampleBy()

Examples

# NOT RUN {
df <- createDataFrame(cbind(model = rownames(mtcars), mtcars))
head(select(df, cov(df$mpg, df$hp), cov("mpg", "hp"),
                covar_samp(df$mpg, df$hp), covar_samp("mpg", "hp"),
                covar_pop(df$mpg, df$hp), covar_pop("mpg", "hp")))
# }
# NOT RUN {
# }
# NOT RUN {
cov(df, "mpg", "hp")
cov(df, df$mpg, df$hp)
# }