Figure A1.

Robust and optimal designs. For the GMRF smoothing prior with for all and , we show that the optimal design point is not always the same as the robust design point, at which . The colored curves are (along the dashed arrow) for at , and computed across all partitions for any given (hence the zig-zagged form). The gray vertical lines mark the robust point for each curve, and the black circles give the optimal points. While these lines and circles do not always match, both generally feature approximately the same values. We found this to be the case across several and values.