Figure 3.—

Absolute log-ratio error (ALRErr) of various conditional sampling distributions. See (22) for a formal definition of ALRErr_k,n(· | ·). The accuracy of is almost indistinguishable from that of , the most accurate of all approximate CSDs considered here. As expected, discretization reduces the accuracy somewhat, but even is substantially more accurate than and . With θ₀ = 0.01 and ρ₀ = 0.05, we used the methodology described in the text to sample 250 conditional configurations, each with n = 10 haplotypes and k loci. (A) Error is measured relative to the true CSD π, estimated using computationally intensive importance sampling. (B) Error is measured relative to , computed by numerically solving a recursion for the equivalent CSD .