Function sampleobservation_replicates 

pub fn sampleobservation_replicates<R>(
    spec: &GenerativeSpec,
    n_draws: usize,
    rng: &mut R,
) -> Result<ArrayBase<OwnedRepr<f64>, Dim<[usize; 2]>>, EstimationError>
where
    R: Rng + ?Sized,

Collect multiple synthetic replicates into an n_draws × nobs matrix.

This is intentionally the allocating convenience surface. Streaming consumers should call sampleobservation_replicate_chunks directly.