Nothing
"SD" <-
function (x, na.rm = TRUE)
{
if (is.matrix(x))
apply(x, 2, SD, na.rm = na.rm)
else if (is.vector(x))
sqrt(var(x, na.rm = na.rm,use="pair"))
else if (is.data.frame(x))
apply(x,2, SD, na.rm = na.rm)
else sqrt(var(as.vector(x), na.rm = na.rm,use="pair"))
}
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