11.2.2 Absolute deviation

(`absdev``data`)-
Compute the absolute deviation from the mean of
`data`The absolute deviation from the mean is defined as(11.5)

where are the elements of the dataset`data`. The absolute deviation from the mean provides a more robust measure of the width of a distribution than the variance. This function computes the mean of`data`via a call to`mean`.

(`absdev_m``data, mean`)-
Compute the absolute deviation of the dataset
`data`relative to the given value of`mean`(11.6)

This function is useful if you have already computed the mean of`data`(and want to avoid recomputing it), or wish to calculate the absolute deviation relative to another value (such as zero, or the median).