Time-series analysis Signal processing 41 Forecasting 23 Mathematical models 20 Statistical methods 19 Frequency spectra 18 Data processing 17 Mathematics 13 Computer programs 10 Econometrics 9 Nonlinear theories 9 Prediction theory 9 Wavelets (Mathematics) 8 Digital techniques 7 Biomedical engineering 6 Dynamics 6 Electrocardiography 6 Finance 6 R (Computer program language) 6 Regression analysis 6 Stochastic processes 6 Computer-aided design 5 Feedback control systems 5 Integrated circuits 5 Mathematical statistics 5 Risk management 5 Transfer functions 5 Very large scale integration 5 Computational intelligence 4 Discrete-time systems 4