pub fn canonical_correlations(x: &[f64], f: usize, p: usize) -> Result<Cancorr>
Canonical correlations between (x_t, …, x_{t+f-1}) and (x_{t-1}, …, x_{t-p}), from the biased sample autocovariances.
(x_t, …, x_{t+f-1})
(x_{t-1}, …, x_{t-p})