Email questions about the code to pfc <AT> stat.osu.edu
The file GSSM.R contains R code to approximately simulate stationary Gaussian processes using the Gaussian Spectral Synthesis Method (GSSM).
Look at the file test_GSSM.R for some simple examples of how to approximately simulate time series using these R functions.
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pp. 291-292, D. B. Percival and A. T. Walden. Wavelet Methods for Time Series Analysis. Cambridge University Press, Cambridge, 2000.
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D. B. Percival (1992), Simulating Gaussian Random Processes with Specified Spectra, Computing Science and Statistics, 24, 534-538.