powered by
This function computes the standard deviation of the values in x. If na.rm is TRUE then missing values are removed before computation proceeds.
x
na.rm
TRUE
sd(x, na.rm = FALSE)
a numeric vector or an R object which is coercible to one by as.double(x).
as.double(x)
logical. Should missing values be removed?
Like var this uses denominator \(n - 1\).
var
The standard deviation of a zero-length vector (after removal of NAs if na.rm = TRUE) is not defined and gives an error. The standard deviation of a length-one vector is NA.
NA
na.rm = TRUE
var for its square, and mad, the most robust alternative.
mad
sd(1:2) ^ 2
Run the code above in your browser using DataLab