Data swapping for protecting census tables


Shlomo, Natalie, Tudor, Caroline and Groom, Paul (2010) Data swapping for protecting census tables. Southampton, GB, Southampton Statistical Sciences Research Institute, University of Southampton (S3RI Methodology Working Papers, M10/06).

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Description/Abstract

The pre-tabular statistical disclosure control (SDC) method of data swapping is the preferred method for protecting Census tabular data in some National Statistical Institutes, including the United States and Great Britain. A pre-tabular SDC method has the advantage that it only needs to be carried out once on the microdata and all tables released (under the conditions of the output strategies, eg. fixed categories of variables, minimum cell size and population thresholds) are considered protected. In this paper, we propose a method for targeted data swapping. The method involves a probability proportional to size selection strategy of high risk households for data swapping. The selected households are then paired with other households having the same control variables. In addition, the distance between paired households is determined by the level of risk with respect to the geographical hierarchies. The strategy is compared to a random data swapping strategy in terms of the disclosure risk and data utility.

Item Type: Monograph (Working Paper)
Keywords: targeted data swap, random data swap, disclosure risk, data utility, r-u confidentiality map
Subjects: H Social Sciences > HA Statistics
Divisions: University Structure - Pre August 2011 > Southampton Statistical Sciences Research Institute
ePrint ID: 160661
Date Deposited: 16 Jul 2010 10:23
Last Modified: 27 Mar 2014 19:16
URI: http://eprints.soton.ac.uk/id/eprint/160661

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