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Open-Source, Step-Counting Algorithm for Smartphone Data Collected in Clinical and Nonclinical Settings: Algorithm Development and Validation Study

Open-Source, Step-Counting Algorithm for Smartphone Data Collected in Clinical and Nonclinical Settings: Algorithm Development and Validation Study

First, we verified if the acceleration data were provided in gravitational units (g); data provided in SI units were converted using the standard definition: 1 g = 9.80665 m/s2. Second, we used linear interpolation to impose a uniform sampling frequency of 10 Hz across triaxial accelerometer data. Third, we transformed the triaxial accelerometer signals into sensor orientation-invariant vector magnitudes.

Marcin Straczkiewicz, Nancy L Keating, Embree Thompson, Ursula A Matulonis, Susana M Campos, Alexi A Wright, Jukka-Pekka Onnela

JMIR Cancer 2023;9:e47646