| Feature | Citation | Definition |
| Mean | [18, 74, 75, 92, 95, 180–184] | The summation of data points divided by their number | Std deviation | [18, 58, 74, 75, 180, 183, 184] | It is the square root of variance | Average deviation | [18, 58, 74, 180, 183] | The average separation of data points from their mean or average value | Skewness | [18, 180, 183] | Measures the asymmetry from the mean value. It utilizes the mean and the variance | Kurtosis | [18, 180, 183] | Estimates the frequency of extreme values. It utilizes the mean value in its formula | RMS amplitude | [18, 180, 183, 184] | It is leveraged to calculate the power of a signal. It utilizes the maximum value of a set | Lowest value | [18, 180, 182–184] | The maximum data point | Highest value | [18, 180, 182–184] | The minimum data point | ZCR | [18, 183] | Zero crossing rate is a counter of how many times the data points cross the zero value | Nonnegative count | [18, 183] | Total number of positive data points in a set | Average absolute difference | [75, 185] | The average of the total differences between all data points in a set | Time between peaks | [75, 184, 185] | The number of points between two high peaks or low peaks | Binned distribution | [75] | The processes of grouping data points into smaller number of points or “bins” |
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