Aggregate the columns in the LazyFrame to their variance value

Description

Aggregate the columns in the LazyFrame to their variance value

Usage

<LazyFrame>$var(ddof = 1)

Arguments

ddof	"Delta Degrees of Freedom": the divisor used in the calculation is N - ddof, where N represents the number of elements. By default ddof is 1.

Value

A polars LazyFrame

Examples

library("polars")

lf <- pl$LazyFrame(a = 1:4, b = c(1, 2, 1, 1))
lf$var()$collect()

#> shape: (1, 2)
#> ┌──────────┬──────┐
#> │ a        ┆ b    │
#> │ ---      ┆ ---  │
#> │ f64      ┆ f64  │
#> ╞══════════╪══════╡
#> │ 1.666667 ┆ 0.25 │
#> └──────────┴──────┘

lf$var(ddof = 0)$collect()

#> shape: (1, 2)
#> ┌──────┬────────┐
#> │ a    ┆ b      │
#> │ ---  ┆ ---    │
#> │ f64  ┆ f64    │
#> ╞══════╪════════╡
#> │ 1.25 ┆ 0.1875 │
#> └──────┴────────┘