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This package aims to provide functions to estimate higher-order spectra or polyspectra of multivariate time series, such as bispectrum and bicoherence (Brillinger and Irizarry 1998). They are useful for e.g. detecting nonlinear interaction between stationary time series driven by periodic signals (Abe et al. 2024).
You can install the released version of rhosa from CRAN with:
Alternatively, the development version from GitHub with remotes:
The author thanks Alessandro E. P. Villa for his generous support to this project.
Abe, Takeshi, Yoshiyuki Asai, Alessandra Lintas, and Alessandro E. P. Villa. 2024. “Detection of Quadratic Phase Coupling by Cross-Bicoherence and Spectral Granger Causality in Bifrequencies Interactions.” Scientific Reports 14 (1): 8521. https://doi.org/10.1038/s41598-024-59004-8.
Brillinger, D. R., and R. A. Irizarry. 1998. “An Investigation of the Second- and Higher-Order Spectra of Music.” Signal Processing 65 (2): 161–79. https://doi.org/10.1016/S0165-1684(97)00217-X.
These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.
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