Table 1 Description of 78 features used in the behavioural classifications of triaxial accelerometer data

Mean

Mean of measurement along each axis

Variance

variance of measurement along each axis

Standard deviation

Standard deviation of measurement along each axis

Coefficient of variance

Coefficient of variance of measurement along each axis

Skewness

Skewness of measurement along each axis

Kurtosis

Kurtosis of measurement along each axis

Maximum

Maximum value of measurement along each axis

Minimum

Minimum value of measurement along each axis

Range

Range of measurement along each axis

Euclidean norm

Euclidean norm of measurement along each axis

Covariance

Covariance of measurements between two axes

Correlation

Pearson correlation of measurements between two axes

Mean difference

Mean difference of measurements between two axes

Standard deviation of difference

Standard deviation of measurements between two axes

Variance of static body acceleration

variance of static body acceleration along each axis

Variance of dynamic body acceleration

variance of dynamic body acceleration along each axis

Mean dynamic body acceleration

Overall dynamic body acceleration along each axis

Maximum dynamic body acceleration

Maximum value of dynamic body acceleration along each axis

Overall Dynamic Body Acceleration

Overall Dynamic Body Acceleration

Pitch

Pitch angle of the device

Roll

Roll angle of the device

Mean difference of continuous points

Mean difference between two continuous points along each axis

Variance of difference of continuous points

variance of difference between two continous points along each axis

Main frequency

Frequency at the main frequency along each axis

Amplitude of main frequency

Maximum amplitude of fft along each axis

25% quartile

25% quartile of measurement along each axis

50% quartile

50% quartile of measurement along each axis

75% quartile

75% quartile of measurement along each axis