Important: The stats package has been deprecated. Use the superseding package Statistics instead.

The tally function of the subpackage stats[transform, ...] groups together the items of data that have the same value.

The ordering of the result is unpredictable. The utility stats[transform, statsort] can be useful.

To regroup data into a particular target pattern, use stats[transform, tallyinto].

$\mathrm{with}\left(\mathrm{stats}\right)\:$

$\mathrm{data1}≔\left[10\,10\,10\,20\,20\,30\right]$

$\mathrm{data1}≔\left[10\,10\,10\,20\,20\,30\right]$

$\mathrm{transform}\left[\mathrm{tally}\right]\left(\mathrm{data1}\right)$

$\left[\mathrm{Weight}\left(10\,3\right)\,\mathrm{Weight}\left(20\,2\right)\,30\right]$

$\mathrm{data2}≔\left[1\,2\,3\,\mathrm{missing}\,3\,4..5\,4..5\,\mathrm{Weight}\left(4..5\,6\right)\,6..7\,6..7\right]$

$\mathrm{data2}≔\left[1\,2\,3\,\mathrm{missing}\,3\,4..5\,4..5\,\mathrm{Weight}\left(4..5\,6\right)\,6..7\,6..7\right]$

$\mathrm{transform}\left[\mathrm{tally}\right]\left(\mathrm{data2}\right)$

$\left[1\,2\,\mathrm{Weight}\left(3\,2\right)\,\mathrm{Weight}\left(4..5\,8\right)\,\mathrm{Weight}\left(6..7\,2\right)\,\mathrm{missing}\right]$