Expert Meeting on Statistical Data Confidentiality

The presentation outlines the practical application and evaluation of the targeted record swapping (TRS) method in the context of the 2021 Polish Census (NSP2021), specifically for population data dissemination within a 1 km² grid framework. The method, recommended by Eurostat, was employed to address statistical disclosure control (SDC) requirements while preserving data utility. The talk covers organizational challenges, software issues, and methodological decisions, including the choice of key parameters such as swap rate, risk and similarity variables, and administrative hierarchies. Emphasis is placed on the balance between protecting individual confidentiality (through k-anonymity and l-diversity rules) and maintaining the analytical value of spatial demographic data. The outcomes, accepted by Eurostat, demonstrate the feasibility and effectiveness of TRS under real-world constraints, providing a foundation for further refinement and standardization of this approach in future census rounds.