Accelerometer Jerk

computed from raw feature: cortex.raw.accelerometer

Description

Computes jerk from accelerometer data. Jerk is the derivative of accelerometer.

Optional or required kwargs

• start: (int, units: ms) the start time.
• end: (int, units: ms) the end time.
• threshold: (int, units: ms, default: 500) the maximum difference between timestamps to compute jerk.

Data

• timestamp: (int, units: ms) the start time of the jerk.
• acc_jerk: (float, units: m/s^3) the jerk.

Example

cortex.primary.acc_jerk.acc_jerk(id="U1234567890", start=0, end=cortex.now())

Output:

{
  'timestamp': 0,
  'duration': 1627067480000,
  'data': [
           {'timestamp': 1607094903526, 'acc_jerk': 0.008896610358911157},
                 .
                 .
                 .
           {'timestamp': 1607094950000, 'acc_jerk': 0.0028039384631051243}
          ],
  'has_raw_data': 1,
}