Mean(), Median(), etc. are mere wrappers of
the functions mean(), median(), etc. with the
na.rm= optional argument set TRUE by default.
Mean(x, na.rm=TRUE, ...)
Median(x, na.rm=TRUE, ...)
Min(x, na.rm=TRUE, ...)
Max(x, na.rm=TRUE, ...)
Weighted.Mean(x, w, ..., na.rm = TRUE)
Var(x, na.rm=TRUE, ...)
StdDev(x, na.rm=TRUE, ...)Cov(x, y = NULL, use = "pairwise.complete.obs", ...)
Cor(x, y = NULL, use = "pairwise.complete.obs", ...)
Range(..., na.rm = TRUE, finite = FALSE)