vignettes/feature_definitions.Rmd
feature_definitions.Rmd| Feature Name | Definition |
|---|---|
| meanTapInter | mean tapping interval |
| medianTapInter | median tapping interval |
| iqrTapInter | interquartile range tapping interval |
| minTapInter | minimum tapping interval |
| maxTapInter | maximum tapping interval |
| skewTapInter | skewness tapping interval |
| kurTapInter | kurtosis tapping interval |
| sdTapInter | standard deviation tapping interval |
| madTapInter | mean absolute deviation tapping interval |
| cvTapInter | coefficient of variation tapping interval |
| rangeTapInter | range tapping interval |
| tkeoTapInter | teager-kaiser energy operator tapping interval |
| ar1TapInter | autocorrelation (lag = 1) tapping interval |
| ar2TapInter | autocorrelation (lag = 2) tapping interval |
| fatigue10TapInter | difference in mean tapping interval between the first and last 10% of the tapping interval series |
| fatigue25TapInter | difference in mean tapping interval between the first and last 25% of the tapping interval series |
| fatigue50TapInter | difference in mean tapping interval between the first and last 50% of the tapping interval series |
| meanDriftLeft | mean drift in the left button |
| medianDriftLeft | median drift in the left button |
| iqrDriftLeft | interquartile range of drift in the left button |
| minDriftLeft | minimum of drift in the left button |
| maxDriftLeft | maximum of drift in the left button |
| skewDriftLeft | skewness of drift in the left button |
| kurDriftLeft | kurtosis of drift in the left button |
| sdDriftLeft | standard deviation of drift in the left button |
| madDriftLeft | mean absolute deviation of drift in the left button |
| cvDriftLeft | coefficient of variation of drift in the left button |
| rangeDriftLeft | range of drift in the left button |
| meanDriftRight | mean drift in the right button |
| medianDriftRight | median drift in the right button |
| iqrDriftRight | interquartile range of drift in the right button |
| minDriftRight | minimum of drift in the right button |
| maxDriftRight | maximum of drift in the right button |
| skewDriftRight | skewness of drift in the right button |
| kurDriftRight | kurtosis of drift in the right button |
| sdDriftRight | standard deviation of drift in the right button |
| madDriftRight | mean absolute deviation of drift in the right button |
| cvDriftRight | coefficient of variation of drift in the right button |
| rangeDriftRight | range of drift in the right button |
| numberTap | number of taps |
| buttonNoneFreq | frequency where neither the left or right buttons were hit |
| corXY | correlation between the X and Y coordinates of the hits |
| Feature Name (.tm =time .fr=frequency) |
Description |
|---|---|
| complexity.tm | Complexity of a time series \[ \sqrt{\frac{Var(f_s^2*\frac{d^2 x}{dt^2 })}{(Var(f_s* \frac{dx}{dt})}} \] Where \(Var\) means variance |
| dfa.tm | Scaling exponent estimated after performing detrended fluctuation analysis(DFA) |
| energy.tm | Total energy |
| IQR.tm | Interquartile Range (Q25 - Q75) |
| Kurtosis.tm | \[E\left[\left(\frac{X-μ}{σ}\right)^4\right]\] Where \(X\) is the signal, \(μ\) is the mean and \(σ\) is the standard deviation; and \(E[.]\) is the expectation |
| mean.tm | Mean \[E[X]\] Where \(X\) is the signal and \(E[.]\) is the expectation |
| median.tm | Median Middle value of the measurements, i.e the 50th Quartile |
| mn.tm | Minimum \[x_{min},x_{min}≤x,∀x\] |
| mobility.tm | Mobility of a time series \[\sqrt{\frac{Var(f_s* \frac{dx}{dt})}{Var(x)}}\] Where \(Var\) means variance |
| mode.tm | Mode, Most occuring measure \[x_{mode}, \#x_{mode} ≥ \#x,∀x\] |
| mtkeo.tm | Mean of the Teager-Kaiser energy operator |
| mx.tm | Max \[x_{max}, x_{max} ≥x,∀x\] |
| Q25.tm | \(25th\) Quartile |
| Q75.tm | \(75th\) Quartile |
| range.tm | Range: Max - Min \[x_{max} - x_{min}\] |
| rmsmag.tm | Root Mean Square Magnitude |
| rough.tm | Roughness or Total Curvature of the time series |
| rugo.tm | Rugosity of the time series |
| sd.tm | Standard Deviation \[E[(X-μ)^2]\] Where \(X\) is the signal, \(μ\) is the mean and \(E[.]\) is the expectation |
| skewness.tm | \[E\left[\left(\frac{X-μ}{σ}\right)^3\right]\] Where \(X\) is the signal, \(μ\) is the mean and \(σ\) is the standard deviation; and \(E[.]\) is the expectation |
| cent.fr | Centroid of the frequency spectrum, i.e the weighted mean of all frequencies present in the Fourier Spectrum \[Centroid = \frac{Σf.H(f)}{ΣH(f)}\] Where \(f\) is the frequency, and \(H(f)\) is the spectral magnitude at that frequency |
| ewt.permEnt.fr | Permutation entropy of the probability mass function(PMF) obtained from the energies of the modes obtained from Empirical Wavelet Transform(EWT) |
| ewt.renyiEnt.fr | Renyi entropy of the PMF calculated using the modes obtained from EWT |
| ewt.shannonEnt.fr | Shannon entropy of the PMF calculated using the modes obtained from EWT |
| ewt.simpsonEnt.fr | Simpson entropy of the PMF calculated using the modes obtained from EWT |
| ewt.tsallisEnt.fr | Tsallis entropy of the PMF calculated using the modes obtained from EWT |
| IQR.fr | Interquartile range (Q75-Q25) |
| kurt.fr | Kurtosis of the frequency probability distribution |
| md.fr | Median frequency |
| mn.fr | Mean frequency |
| mod.fr | Frequency with the maximum amplitude in the frequency spectrum, i.e mode frequency |
| mx.fr | Maximum amplitude of the frequency probability distribution |
| Q25.fr | 25th Quartile of the frequency spectrum |
| Q75.fr | 75th Quartile of the frequency spectrum |
| sd.fr | Standard deviation of the frequency spectrum |
| sem.fr | Mean standard deviation, i.e \[\frac{sd}{\sqrt{n}}\] |
| sfm.fr | Spectral Flatness Measure of the frequency probability distribution |
| sh.fr | Shannon Entropy of the frequency probability distribution |
| skew.fr | Skewness of the frequency probability distribution |
| EnergyInBandk | Energy present in k-(k+1) Hz band of the frequency spectrum |