Nothing
var.fdt <- function(x, ...)
{
brk <- with(x,
seq(breaks['start'],
breaks['end'],
breaks['h']))
mids <- 0.5 * (brk[-1] +
brk[-length(brk)])
y <- with(x,
table[, 2])
res <- sum((mids - mean.fdt(x))^2 * y) / (sum(y) - 1)
return(res)
}
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