"tailconCOP" <- function(t, cop=NULL, para=NULL, ...) {
if(any(t < 0)) {
warning("at least one t < 0, returning NULL")
return(NULL)
}
if(any(t > 1)) {
warning("at least one t > 1, returning NULL")
return(NULL)
}
if (is.null(cop)) {
warning("must have copula argument specified, returning NULL")
return(NULL)
}
I <- ifelse(t < 0.5, 1, 0)
delC <- COP(t, t, cop=cop, para=para, ...)
( delC/t * I) + ((1 - 2*t + delC)/(1-t) * ! I)
}
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