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INADVERTENT DIRECT DISCLOSURE
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A2 and A3 account number adequate data security aggregate corresponding ar+l birth Bn+2 Bureau Canada Pension Plan Canadian census check digit code numbers codes of ethics computer files computer systems Computers Task Force confidential information counts or aggregates deduced disclosed disclosure of confidential EFFECTS ON PRIVACY elementary intersection sets ensure entries equal example Fellegi follows H.S. Gellman horizontally shaded set inadvertent direct disclosure last m-n linear combination linear equations linearly independent marginal totals market research matrix N obtained methods name and address particular person number personal identification number possible Privacy and Computers problem protect confidentiality publication sets published aggregates random numbers random rounding record linkage reduce the rank residual disclosure corresponding Residual disclosure occurs right-hand side Social Insurance Number solution specified number statistic corresponding STATISTICAL DATA BANKS statistical information Statistics Act Statistics Canada tabulation cell testing for residual total bQ union of elementary unique personal identification vertically shaded area zero