Bounded Small Cell Adjustments for Flexible Frequency Table Generators
Statistics Korea has disseminated census data through the Statistical Geographic Information Service (SGIS) system. Users can easily access the system on a web-site and obtain frequencies on the map for diverse size-of-area units according to their selection of variables. In order to control the disclosure risk for frequency tables, we thoroughly examined the Small Cell Adjustments (SCA) method to find the reasons for disclosures: we then suggested the Bounded Small Cell Adjustments (BSCA) procedure in this paper. From the analysis on the census data of a Korean city of approximately 1.5 million people, we demonstrated the efficiency of BSCA, which reduces information loss under B in most cells while maintaining B-anonymity in all cells as intended in the SCA idea. The B denotes the criterion value defining a small cell. Furthermore, we have discussed the relationship between disclosure risk and information loss by BSCA.
KeywordsFrequency table Table generating system Small cell adjustments Information loss Disclosure risk Risk-utility map
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