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  * [ __ ](../../../index.html)
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  * __
  * [ Aggregation ](../aggregation.html)
  * polars.LazyFrame.std 

#  polars.LazyFrame.std  #

LazyFrame.  std  (  _ ddof  :  [ int
](https://docs.python.org/3/library/functions.html#int "\(in Python v3.12\)")
=  1  _ )  →  Self  [ [source]  ](https://github.com/pola-
rs/polars/blob/main/py-polars/polars/lazyframe/frame.py#L5067-L5105) #

    

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 │
    └──────────┴──────────┘
    

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