Features
Statistik
Für jede Dimension (Aggregate):
- Mittelwert
- Standardabweichung
- Skewness, Kurtosis, höhere Momente
- Maxima, Minima
Zeitreihensicht:
- Crosscorrelation zwischen Dimensionen und Autokorrelation
- Ordnung AR/MA, Parameter
Modellparameter
http://stats.stackexchange.com/questions/50807/features-for-time-series-classification http://nips.cc/Conferences/2012/Program/event.php?ID=3217 http://robjhyndman.com/hyndsight/tscharacteristics/
Transformationen
SAX
SVD
- SVD: Problem bei verschieden langen Zeitreihen
- Vorschläge:
- Auffüllen durch resamplen vergangener Werte
DFT
http://stats.stackexchange.com/questions/51475/series-dimensionality-reduction-for-classification-input?rq=1 http://stats.stackexchange.com/questions/9475/time-series-clustering/19042#19042 https://www.youtube.com/watch?v=wd6hAPS4ILc
Wavelet
http://stats.stackexchange.com/questions/51475/series-dimensionality-reduction-for-classification-input?rq=1 http://stats.stackexchange.com/questions/39007/clustering-time-series-with-wavelets-in-r?rq=1
Distanzmaße
Dynamic Time Warping
KNN + Dynamic Time Warping. http://stats.stackexchange.com/questions/66027/time-series-classification-very-poor-results?rq=1