Cross-recurrence quantification

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Cross-Recurrence Quantification (CRQ) is a nonlinear method that quantifies how similarly two observed data series unfold over time (Shockley, Butwill, Zbilut, & Webber, 2002; Zbilut, Giuliani, & Webber, 1998)

Shockley, K., Butwill, M., Zbilut, J., & Webber, C. (2002). Cross recurrence quantification of coupled oscillators. Physics Letters A, 305(1–2), 59–69.

Zbilut, J. P., Giuliani, A., & Webber, C. L. Jr (1998). Detecting deterministic signals in exceptionally noisy environments using cross-recurrence quantification. Physics Letters A, 246(1–2), 122–128.