Sensitivity to the ambiguity-bonus weight is non-monotonic on PACIFIC: among rho values 0.1, 0.3, and 0.5, rho=0.3 has the highest overall F1, ambiguous-query clarification rate, and reported selectivity. Raising rho to 0.5 reduces F1 and recall and does not improve selectivity over the main setting.

来源：paper:PDF p. 12, Appendix A.5 and Table 9