This pairing receives no monitored prompts, so it accumulates no observations and is excluded from every published rate.
Legacy News TopicsStateNot measurable Observed runs0 Run dates0 Observed domains0
Outside the measurable population
Legacy News Topics: Problem-first research in the Machine Relations Index
Not measurable in this benchmark. The Legacy News Topics node only receives news-shaped prompts, so the Problem-first research pairing accumulates no observations and is excluded from the measurable population and from every published rate. This is a property of the prompt basket, not a finding about the market.
Segment-specific denominator. Not the overall domain denominator.
Release floor: 7 dates.
Only released domains with evidence in this exact segment.
Observed domains
No observations, and none expected
This pairing is never sampled, so the absence of rows is a property of the prompt basket and carries no information about the sources in this market.
| Source | Source role | Cited runs | Observed runs | Run dates | State |
|---|
Release and boundary
How to cite this segment
Legacy News Topics / Problem-first research: not measurable in this benchmark; this pairing receives no monitored prompts, so it accumulates no observations, 2026-05-10 to 2026-09-18, mri_score_v2.0, mri_score_v2.0+2026-09-18+8fa38e54dd0a, https://machinerelations.ai/index/categories/legacy-unmapped/problem_first.
Release mri_score_v2.0+2026-09-18+8fa38e54dd0a; methodology mri_score_v2.0; generated 2026-09-18; window 2026-05-10 to 2026-09-18; artifact 8fa38e54dd0a.
MRI measures observed root-domain citations inside monitored prompts. Segment rates are conditional on this sample and do not claim recommendation quality, traffic, placement availability, or commercial performance.