# | Secondary feature | Calculation notes |
---|---|---|

1 | Mean | Mean value of each channel for a single motion |

2 | Standard deviation | Standard deviation of each channel |

3 | Duration | Number continuous samples above 20th percentile value for the motion |

4 | Energy | Squared sum of the data sequence |

5 | Dominant frequency power | The peak power of the Power Spectral Density (PSD), calculated with periodogram function in Matlab |

6 | Dominant frequency | The peak frequency of PSD |

7 | Mean power | Average power of PSD |