daft.functions.var#

var #

var(expr: Expression, ddof: int = 1) -> Expression

Calculates the variance of the values in the expression.

Parameters:

Name	Type	Description	Default
`expr`	`Expression`	The input expression to calculate variance for.	required
`ddof`	`int`	Delta degrees of freedom. The divisor used in calculations is N - ddof, where N is the number of non-null elements. Defaults to 1 (sample variance).	`1`

Returns:

Type	Description
`Expression`	Expression representing the variance.

Source code in daft/functions/agg.py

def var(expr: Expression, ddof: int = 1) -> Expression:
    """Calculates the variance of the values in the expression.

    Args:
        expr: The input expression to calculate variance for.
        ddof: Delta degrees of freedom. The divisor used in calculations
            is N - ddof, where N is the number of non-null elements.
            Defaults to 1 (sample variance).

    Returns:
        Expression representing the variance.
    """
    return Expression._from_pyexpr(expr._expr.var(ddof))