The var function from the stats is replace by a new
method in order to report the variance of circular data
appropriately. var.default is an alias of the original function
var see cor. The behavior would be the same for objects which are not
from class data.frame and
circular (in the last case the variance is define as one
minus the mean resultant length divided by the sample size of data, see
var.circular for more details). The method for
data.frame will apply the var function to each columns.
var(x, ...)
# S3 method for default
var(x, y = NULL, na.rm = FALSE, use, ...)
# S3 method for data.frame
var(x, ...)
a numeric vector, matrix or data frame.
NULL (default) or a vector, matrix or data frame with
compatible dimensions to x. The default is equivalent to
y = x (but more efficient).
logical. Should missing values be removed?
an optional character string giving a
method for computing covariances in the presence
of missing values. This must be (an abbreviation of) one of the strings
"all.obs", "complete.obs" or "pairwise.complete.obs".
further arguments passed to or from other methods.
cor, var.circular, rho.circular and summary.circular.