Nothing
VV.lnre <- function (obj, N=NA, ...)
{
if (! inherits(obj, "lnre")) stop("first argument must be object of class 'lnre'")
if (missing(N)) stop("argument 'N' is required for 'lnre' objects")
if (!(is.numeric(N) && all(N >= 0))) stop("argument 'N' must be non-negative integer")
EV(obj, 2*N) - EV(obj, N)
}
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