The selected mean delay difference is positive after at most one record removal per file in 266 ds000030 files.

Across 266 OpenNeuro ds000030 stop-signal event files, the selected mean difference between nominal and recorded stop-signal delay remained positive under the tested rule: each file could retain all active records or lose one GO or STOP record, with selection recalculated after removal. Exact rational certificates bound the selected mean from 21.2301409306722287896642527978933508887425938117182356813693 to 32.9976070461411913815162651422349258200626105893561998094460 ms. These are limits over fixed record choices, not confidence limits or estimates of biological stopping time. The result assumes equal file weights and fixed remaining values. It does not test multiple removals per file, other selection rules, another dataset version, or sampling or measurement uncertainty. The event-field units are inferred from a prior calculation; the package has no unit sidecar.

stop-signal task · record removal · sensitivity analysis · exact arithmetic · reaction time · OpenNeuro ds000030