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BIS drift against the recorder PC

Drift of the BIS EEG stamps against the recorder PC, per case, from whole teeth.
Value 25 ppm (p10–p90 12 to 50; 5th–95th 7.3–51.1 ppm; census fit of 4,728 recordings median 21.1 ppm)
Status measured: Measured in a study.
From The stamp sawtooth model for SNUADC and BIS
About BIS against the recorder PC
Date 2026-10-19

By setup

Per recording setup (PC key: SNUADC · Solar8000 · Primus · BIS serial ports; see Recording setups). For a recording whose setup is known, use its row: the spread within a setup is far smaller than over all recordings.

Setup Value (ppm) IQR Cases Note
COM4 · COM6 · COM5 · COM8 44.1 42.7 to 46.9 186
COM4 · COM12 · COM11 · COM14 50.5 49.7 to 51 178
COM19 · COM26 · COM27 · COM29 32.3 30.6 to 38.6 93
COM12 · COM4 · COM5 · COM7 21.5 20.5 to 22.6 75
COM4 · COM9 · COM10 · COM20 18.6 17.9 to 19.2 64
COM3 · COM4 · COM5 · COM7 25.1 23.3 to 32.2 60
COM13 · COM26 · COM27 · COM19 17.4 16.7 to 18.1 56
COM25 · COM26 · COM27 · COM29 30.9 29.2 to 32.4 56
COM4 · COM5 · COM6 · COM3 49.4 48.2 to 49.8 53
COM7 · COM4 · COM5 · COM9 18.9 17.8 to 19.7 51
COM18 · COM13 · COM14 · COM6 18.2 17.5 to 18.8 48
COM4 · COM5 · COM6 · COM8 54.7 52.6 to 55.2 44
COM4 · COM9 · COM10 · COM12 30.5 29.9 to 31.3 44
COM13 · COM14 · COM15 · COM19 18.4 17.8 to 19.4 39
COM4 · COM5 · COM6 · COM12 28.2 27.8 to 30 39
COM14 · COM10 · COM11 · COM18 25.6 24.8 to 26.5 38
COM45 · COM42 · COM43 · COM39 18.8 18.3 to 20.1 37
COM14 · COM4 · COM5 · COM7 26.3 25.7 to 26.8 36
COM15 · COM13 · COM14 · COM22 19.9 18.9 to 21.1 31
COM4 · COM11 · COM12 · COM8 23.6 22.8 to 24.5 30
COM4 · COM5 · COM6 · COM20 17.2 16.1 to 17.8 27
COM8 · COM42 · COM43 · COM39 18.7 18.1 to 19.8 26
COM4 · COM26 · COM27 · COM29 30.8 30.4 to 31.7 25
COM15 · COM25 · COM26 · COM30 24.4 23.9 to 24.8 23
COM15 · COM26 · COM27 · COM29 29.9 24.3 to 30.4 23
COM13 · COM4 · COM5 · COM23 19.3 18.5 to 20.7 20
COM8 · COM14 · COM15 · COM4 21 19.6 to 22.6 20
COM9 · COM15 · COM16 · COM20 26.4 26.1 to 27.2 20
COM13 · COM4 · COM5 · COM9 19.5 19.1 to 20.6 18
COM14 · COM21 · COM22 · COM18 24.7 24.3 to 25.1 18
COM31 · COM28 · COM29 · COM34 18.2 17.6 to 19.3 18
COM9 · COM10 · COM11 · COM16 17.8 17 to 18.6 18
COM3 · COM15 · COM16 · COM20 22.9 22.3 to 23.7 16
COM4 · COM11 · COM12 · COM3 49.1 48.1 to 50 14
COM15 · COM27 · COM26 · COM29 28.6 26.4 to 29.3 9
COM32 · COM28 · COM27 · COM30 42.6 42.5 to 42.6 9
COM4 · COM13 · COM14 · COM6 18.8 18.3 to 19.8 9

Notes

Full release, replacing the pilot value of 23 ppm (p10–p90 17–47). From the correction steps of all recordings (When each device's clock is corrected, in every recording, 19 October): median 24.8 ppm (5th–95th 7.3–51.1) in 1,939 recordings, identical to the clock-correction scan where both exist; the full census fit gives 4,728 recordings, median 21.1 ppm (5th–95th 2.1–52.8). Relative to the recorder PC.

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