polars.Expr.std

Expr.std(ddof: int = 1) → Self

Get standard deviation.

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({"a": [-1, 0, 1]})
>>> df.select(pl.col("a").std())
shape: (1, 1)
┌─────┐
│ a   │
│ --- │
│ f64 │
╞═════╡
│ 1.0 │
└─────┘