__Statistics:__double**gsl_stats_absdev***(const double*`data`[], size_t`stride`, size_t`n`)-
This function computes the absolute deviation from the mean of
`data`, a dataset of length`n`with stride`stride`. The absolute deviation from the mean is defined as,where @math{x_i} 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`gsl_stats_mean`

.

__Statistics:__double**gsl_stats_absdev_m***(const double*`data`[], size_t`stride`, size_t`n`, double`mean`)-
This function computes the absolute deviation of the dataset
`data`relative to the given value of`mean`,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).

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