Surrogate time series using Fourier surrogates
Creates surrogate time series using Fourier surrogates
fftsurrog(dat, nsurrogs, syncpres)
dat |
A locations x time matrix of observations |
nsurrogs |
The number of surrogates to produce |
syncpres |
Logical. TRUE for "synchrony preserving" surrogates (same phase randomizations used for all time series). FALSE leads to independent phase randomizations for all time series. |
fftsurrog returns a list of nsurrogs surrogate datasets
For internal use, no error checking
Jonathan Walter, jaw3es@virginia.edu; Lawrence Sheppard, lwsheppard@ku.edu; Daniel Reuman, reuman@ku.edu
Sheppard, LW, et al. (2016) Changes in large-scale climate alter spatial synchrony of aphid pests. Nature Climate Change. DOI: 10.1038/nclimate2881
Schreiber, T and Schmitz, A (2000) Surrogate time series. Physica D 142, 346-382.
Prichard, D and Theiler, J (1994) Generating surrogate data for time series with several simultaneously measured variables. Physical Review Letters 73, 951-954.
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