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

The function classmark of the subpackage stats[transform, ...] replaces classes by their class mark in the given data.

The class mark of a class is its midpoint. A class is represented by the range data structure. When the distinction is important (such as for the transform[tallyinto] function), the lower bound is inclusive and the upper bound is exclusive. Therefore, $a..b$ represents data  points $x$ such that $a<=x<b$.

Data not given as a class (or range) are left unchanged.

$\mathrm{with}\left(\mathrm{stats}\right)\&colon;$

$\mathrm{data1}≔\left[1..3\&comma;4..5\right]$

$\mathrm{data1}≔\left[1..3\&comma;4..5\right]$

$\mathrm{transform}\left[\mathrm{classmark}\right]\left(\mathrm{data1}\right)=\left[\frac{1+3}{2}\&comma;\frac{4+5}{2}\right]$

$\left[2\&comma;\frac{9}{2}\right]=\left[2\&comma;\frac{9}{2}\right]$

$\mathrm{data2}≔\left[\mathrm{Weight}\left(3..9\&comma;10\right)\right]$

$\mathrm{data2}≔\left[\mathrm{Weight}\left(3..9\&comma;10\right)\right]$

$\mathrm{transform}\left[\mathrm{classmark}\right]\left(\mathrm{data2}\right)=\left[\mathrm{Weight}\left(\frac{3+9}{2}\&comma;10\right)\right]$

$\left[\mathrm{Weight}\left(6\&comma;10\right)\right]=\left[\mathrm{Weight}\left(6\&comma;10\right)\right]$

$\mathrm{data3}≔\left[\mathrm{Weight}\left(3\&comma;10\right)\&comma;\mathrm{missing}\&comma;4\&comma;\mathrm{Weight}\left(11..12\&comma;3\right)\&comma;15..17\right]$

$\mathrm{data3}≔\left[\mathrm{Weight}\left(3\&comma;10\right)\&comma;\mathrm{missing}\&comma;4\&comma;\mathrm{Weight}\left(11..12\&comma;3\right)\&comma;15..17\right]$

$\mathrm{transform}\left[\mathrm{classmark}\right]\left(\mathrm{data3}\right)$

$\left[\mathrm{Weight}\left(3\&comma;10\right)\&comma;\mathrm{missing}\&comma;4\&comma;\mathrm{Weight}\left(\frac{23}{2}\&comma;3\right)\&comma;16\right]$