(Weighted) Standard Deviation
This function computes the standard deviation of the values in
x.
If na.rm is TRUE then missing values are removed before
computation proceeds.
SD(x, weights = NULL, na.rm = FALSE, ...)
x |
a numeric vector or an R object which is coercible to one
by |
weights |
a numerical vector of weights the same length as |
na.rm |
logical. Should missing values be removed? |
... |
further arguments passed to or from other methods. |
Like var this uses denominator n - 1.
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.
SD(1:2)^2
Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.