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\sigma² = (\sum w_i (x_i - \mu)²⁾ / (\sum w_i)