Terrorist Group Behavior Prediction by Wavelet Transform-Based Pattern Recognition

Figure 6

Time-frequency structures of wavelet transform coefficient (a), wavelet power spectrum (b), and wavelet variance (c) of the four select measures ( Node count, Component size, Clustering coefficient, and Clique count). The blue areas in (a) and (b) correspond to negative wavelet transform coefficients, while red areas show regions with positive wavelet transform coefficients.

(a) Wavelet transform coefficient

(b) Wavelet power spectrum

(c) Wavelet variance