fitCopula {copula}的使用介绍,
fitCopula(copula, data, method = c("mpl", "ml", "itau", "irho"),
start = NULL, lower = NULL, upper = NULL,
optim.method = "BFGS", optim.control = list(maxit=1000),
estimate.variance = TRUE, hideWarnings = TRUE)
关于data是这样介绍的:
-matrix of (pseudo-)observations (for "mpl" and "ml" with values necessarily in [0,1]) from the copula to be estimated, where n denotes the sample size and d the dimension. Consider applying the function pobs() first in order to obtain values in [0,1].
请问该解释应该怎么理解??


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