Unfixed Sampling Parameter Flips Experiment Result, Exposing a Hidden Measurement Gap

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On August 14, 2026, a developer running a YouTube Shorts screen-metric experiment found that a pre-registered motion median threshold produced contradictory results depending on how many frames were sampled. The same clip scored 47.5% motion median across 8 frames — a fail — and 56.5% across 24 frames — a pass — with no sampling parameter ever specified in the pre-registration. The developer identified the root cause as an undefined measurement: a threshold without a pinned sample count, window, or sampling rule cannot reliably adjudicate any outcome. A new rule was immediately documented requiring all rate predictions to specify those three parameters alongside their threshold, and the very next pre-registration followed it within 24 hours. A subsequent corpus audit initially suggested the rule had already failed, but a git log check confirmed the other two non-compliant documents predated the rule itself.

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