Stricter than md_compare_frames() and shaped differently, because tiered
results do not share an identity set across references: the frame carries
one row per identity that drew at least one candidate, and a larger reference
reaches more of them (4,733 identities on the monthly BMF against 4,793 on the
augmented one — pfmatch/dev/VARIANT-CLASS-AB.md).
Usage
md_compare_tiered(
baseline,
candidate,
columns = c(".id", "overall_ein", "tier", "decision_score"),
n_sample = 10L
)