polars.Expr.list.var#

Expr.list.var(ddof: int = 1) → Expr[source]#

Compute the var value of the lists in the array.

Parameters:

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.

Examples

>>> df = pl.DataFrame({"values": [[-1, 0, 1], [1, 10]]})
>>> df.with_columns(pl.col("values").list.var().alias("var"))
shape: (2, 2)
┌────────────┬──────┐
│ values     ┆ var  │
│ ---        ┆ ---  │
│ list[i64]  ┆ f64  │
╞════════════╪══════╡
│ [-1, 0, 1] ┆ 1.0  │
│ [1, 10]    ┆ 40.5 │
└────────────┴──────┘