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Usage

ref_process(kernel = c("matern32", "stable"), stable_rank = TRUE, ell = 5)

ref_process() builds the dependence kernel for ref_dynamics(). "matern32" is stable rank + Matern-3/2 + nugget; "stable" is stable rank + nugget only (a single correlation shared by every positive lag), the right model when visits share one fixed lag. ell = Inf also selects the stable kernel.

Argument Description
kernel "matern32" or "stable".
stable_rank Include a subject-level intercept.
ell Initial length-scale (Inf selects the stable kernel).

A ref_process object.