cov
cov.Rd
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. Ifx
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
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.
Examples
if (FALSE) {
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")))}
if (FALSE) {
cov(df, "mpg", "hp")
cov(df, df$mpg, df$hp)}