Function rgsl::statistics::wvariance_with_fixed_mean

pub fn wvariance_with_fixed_mean(
    w: &[f64], 
    wstride: usize, 
    data: &[f64], 
    stride: usize, 
    n: usize, 
    mean: f64
) -> f64

This function computes an unbiased estimate of the variance of the weighted dataset data when the population mean mean of the underlying distribution is known a priori. In this case the estimator for the variance replaces the sample mean \Hat\mu by the known population mean \mu,

\Hat\sigma^2 = (\sum w_i (x_i - \mu)^2) / (\sum w_i)