replace Classes by their Class Mark
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.
It works for weighted data also.
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