Figure 5:

Relative efficiencies for estimating three Matérn covariance parameters, variance = 2, range ∈ {0.1, 0.2}, and smoothness ∈ {1/2,1, 3/2}. Locations form 80 × 80 grid on the unit square, and the four orderings considered are sorted coordinate, middle out, completely random, and AMMD. Results for ungrouped (black) and not grouped (magenta) are presented.