Data Swapping: Variations on a Theme by Dalenius and Reiss

Data swapping, a term introduced in 1978 by Dalenius and Reiss for a new method of statistical disclosure protection in confidential data bases, has taken on new meanings and been linked to new statistical methodologies over the intervening twenty-five years. This paper revisits the original (1982) published version of the the Dalenius-Reiss data swapping paper and then traces the developments of statistical disclosure limitation methods that can be thought of as rooted in the original concept. The emphasis here, as in the original contribution, is on both disclosure protection and the release of statistically usable data bases.