Generate surrogate data for permutation/randomization tests
This is a wrapper function for generating surrogate time series using several different null models.
make_surrogate_data(ts, method = c("random_shuffle", "ebisuzaki",
"seasonal"), num_surr = 100, T_period = 1, alpha = 0)ts |
the original time series |
method |
which algorithm to use to generate surrogate data |
num_surr |
the number of null surrogates to generate |
T_period |
the period of seasonality for seasonal surrogates (ignored for other methods) |
alpha |
standard deviation of seasonal cycle deviates. |
A matrix where each column is a separate surrogate with the same length as 'ts'.
data = make_surrogate_data(block_3sp$x_t)
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