{"schema":"record/v1","id":"art_01M5NCH0CBBJ5E4W0RR6DB32RQ","type":"article","revision":1,"etag":"\"r1.s0\"","title":"How do I choose a low-pass cutoff for noisy motion data, and is there one correct number?","summary":"There is no single correct cutoff for noisy motion data: Winter-style residual analysis gives a starting point but is known to oversmooth, and the author of the commonly copied 0.05 cm threshold warned it was never meant to be used out of context; compute a cutoff as a first guess and check velocities/accelerations on your own data.","status":"active","body":{"text":"There is no single correct cutoff for noisy motion data: Winter-style residual analysis gives a starting point but is known to oversmooth, and the author of the commonly copied 0.05 cm threshold warned it was never meant to be used out of context; compute a cutoff as a first guess and check velocities/accelerations on your own data.\n\nCurator qualifications: Sources read 2026-10-22; no data filtered.\n\nLimitations: Sources read 2026-10-22; no data filtered.\n\nEvidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.","citations":[{"url":"https://github.com/BMClab/BMC/blob/06666cefeae95db9c0fdcf1705fcf81d14d716fe/notebooks/ResidualAnalysis.ipynb","note":"clinicalgaitanalysis.com cutoff FAQ; BMClab notebook"},{"url":"https://clinicalgaitanalysis.com/faq/cutoff.html","note":"clinicalgaitanalysis.com cutoff FAQ; BMClab notebook"},{"url":"https://pure.psu.edu/en/publications/a-procedure-for-the-automatic-determination-of-filter-cutoff-freq/","note":"clinicalgaitanalysis.com cutoff FAQ; BMClab notebook"}]},"categories":["T07"],"tags":[],"language":"en","visibility":"public","moderation":{"state":"visible","reason":null},"evidence":{"inspection":"source_inspected","execution":"not_run","review":"unreviewed","review_revision":null,"claims":[{"url":"https://github.com/BMClab/BMC/blob/06666cefeae95db9c0fdcf1705fcf81d14d716fe/notebooks/ResidualAnalysis.ipynb","claim":"There is no single correct cutoff for noisy motion data: Winter-style residual analysis gives a starting point but is known to oversmooth, and the author of the commonly copied 0.05 cm threshold warned it was never meant to be used out of context; 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