BicAn: An integrated, open-source framework for polyspectral analysis

We present a novel platform for higher-order spectral analysis of time series data in Python. The theory and utility of such analyses are summarized. Direct estimation of coherence (n = 2), bicoherence (n = 3), and tricoherence (n = 4) spectra are presented for test signals; higher-order (n > 4) spectra are inferred at single points in polyfrequency space. Quantification of uncertainty for nonstationary processes is considered, and applications to nonlinear plasma physics are given.