Function coef_variation_py 

pub fn coef_variation_py(
    data: &Bound<'_, PyArray1<f64>>,
    ddof: usize,
) -> PyResult<f64>

Coefficient of variation

Calculates the coefficient of variation (standard deviation / mean). This is a unitless measure of relative variability.

Parameters:

• data: Input data array
• ddof: Degrees of freedom for standard deviation (default: 1)

Returns:

• Coefficient of variation