daft.functions.stddev#

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

    Args:
        expr: The input expression to calculate standard deviation 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 standard deviation).

    Returns:
        Expression representing the standard deviation.
    """
    return Expression._from_pyexpr(expr._expr.stddev(ddof))