Method: Polars::Functions#var

Defined in:
lib/polars/functions/lazy.rb

#var(column, ddof: 1) ⇒ Expr

Get the variance.

This function is syntactic sugar for col(column).var(ddof: ddof).

Examples:

df = Polars::DataFrame.new(
  {
    "a" => [1, 8, 3],
    "b" => [4, 5, 2],
    "c" => ["foo", "bar", "foo"]
  }
)
df.select(Polars.var("a"))
# =>
# shape: (1, 1)
# ┌──────┐
# │ a    │
# │ ---  │
# │ f64  │
# ╞══════╡
# │ 13.0 │
# └──────┘
df["a"].var
# => 13.0

Parameters:

  • column (Object) —

    Column name.

  • ddof (Integer) (defaults to: 1) —

    “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.

Returns:


228
229
230
 
# File 'lib/polars/functions/lazy.rb', line 228

def var(column, ddof: 1)
  col(column).var(ddof: ddof)
end