polars.LazyFrame.std#
- LazyFrame.std(ddof: int = 1) LazyFrame [source]#
Aggregate the columns in the LazyFrame to their standard deviation value.
- 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
>>> lf = pl.LazyFrame( ... { ... "a": [1, 2, 3, 4], ... "b": [1, 2, 1, 1], ... } ... ) >>> lf.std().collect() shape: (1, 2) ┌──────────┬─────┐ │ a ┆ b │ │ --- ┆ --- │ │ f64 ┆ f64 │ ╞══════════╪═════╡ │ 1.290994 ┆ 0.5 │ └──────────┴─────┘ >>> lf.std(ddof=0).collect() shape: (1, 2) ┌──────────┬──────────┐ │ a ┆ b │ │ --- ┆ --- │ │ f64 ┆ f64 │ ╞══════════╪══════════╡ │ 1.118034 ┆ 0.433013 │ └──────────┴──────────┘