The sd function from the base is replace by a new
method in order to report the standard deviation of circular data
appropriatly. sd.default is an alias of the original function
sd see sd. The behavior would be the same
for objects which are not from class
data.frame and circular (in the last case
the standard deviation is define as in Mardia (1972) $$\sqrt{-2\ln r}$$ where r is the mean resultant length of
the data, see sd.circular for more details). The method for
data.frame will apply the sd function to each columns.
sd(x, …)
# S3 method for default
sd(x, na.rm = FALSE, …)
# S3 method for data.frame
sd(x, …)a numeric vector, matrix or data frame.
logical. Should missing values be removed?
further arguments passed to or from other methods.