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,  represents data  points  such that .

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