polars.LazyFrame.var#
- LazyFrame.var(ddof: int = 1) LazyFrame [source]#
Aggregate the columns in the LazyFrame to their variance 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.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 │ └──────┴────────┘