The lower speed boundary of preferred coordination ratio constancy: re-digitised coordinates, analysis code and results
Year: 2026
Type: software
Abstract: Coordinates, code and results for a secondary analysis of Murakami and Otaka (2017, J Phys Ther Sci 29:722-725), which estimated the lower speed boundary of preferred coordination ratio constancy at approximately 62 m/min by unstandardised K-means clustering. The published figure is re-digitised independently, recovering 95 individual markers from its panel B, and breakpoint estimators designed for the purpose are applied to those coordinates. The profile likelihood of the reference segmented model is multimodal, with two separated regions of support near 50 and near 62 m/min, and which region contains the global maximum changes with the error distribution and the variance model. The published data therefore do not identify a unique boundary; the originally reported value is not refuted. Includes the digitisation code, the coordinate sets, source-free audit overlays, MATLAB and Python analysis code, and a single entry point (reproduce_all.py) that regenerates every reported quantity. Version v1.2.0: Documentation and machine-readable reporting were corrected; no numerical results changed. Code is licensed under MIT (LICENSE-CODE); the data files in data/ are licensed under CC BY 4.0 (LICENSE-DATA). Neither the recovered coordinates nor the simulated datasets are the original participants' data, which are not public.
Author: Kurayama, Taichi
Institution: Uekusa Gakuen University
Language: English
Field: Health Professions
Domain: Health Sciences
Open Access status: green
OpenAlex ID: W7203533654