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Comparative Evaluation of Four Different Comparative Evaluation of Four Different Sensitive Tabular Data Protection Methods Sensitive Tabular Data Protection Methods
Using a Real Life Table Structure of Using a Real Life Table Structure of Complex Hierarchies and LinksComplex Hierarchies and LinksPopulated with Artificial DataPopulated with Artificial Data
Ramesh A. DandekarRamesh A. DandekarEnergy Information AdministrationEnergy Information Administration
Washington DCWashington DC
UNECE2007 – 17-19 December 2007
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Tabular Data Protection MethodsTabular Data Protection Methods**
• Classical LP Based Cell SuppressionClassical LP Based Cell Suppression
• Network Flow Based Cell Suppression Network Flow Based Cell Suppression (USBC)(USBC)
• LP Based Synthetic Tabular Data / CTA LP Based Synthetic Tabular Data / CTA (Dandekar 2001)(Dandekar 2001)
• Micro Data Level Noise Addition (USBC)Micro Data Level Noise Addition (USBC)
P = 10 % Rule UsedP = 10 % Rule Used
** Uses Proprietary Research Tools Uses Proprietary Research Tools
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Two Three Dimensional HYPOTHETICALTables
Linked in Four Dimensional Space
1st Table: “Volumes by Grade, Sales Type, PAD
District, and State” , and
2nd Table: “Volumes by Formulation, Sales Type, PAD
District, and State”
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11stst Table Table 22ndnd Table Table GradesGrades FormulationsFormulations• RegularRegular• MidgradeMidgrade• PremiumPremium• Total All GradesTotal All Grades
• ConventionalConventional• OxygenatedOxygenated• ReformulatedReformulated• Total All FormulationsTotal All Formulations
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11stst Table By Grades Table By Grades TotalTotal
GradesGrades
Form
ulat
ions
Form
ulat
ions
2nd
Tab
le B
y Fo
rmul
atio
ns2n
d T
able
By
Form
ulat
ions
Four Layers: 1) DTW 2) Rack 3) Bulk 4) TotalFour Layers: 1) DTW 2) Rack 3) Bulk 4) Total
Corresponding to each PAD, State and US Level CellCorresponding to each PAD, State and US Level Cell
MIS
SING PORTIO
N
MIS
SING PORTIO
N
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1,000 Synthetic Micro Data Records 1,000 Synthetic Micro Data Records Containing Six VariablesContaining Six Variables
Four Categorical VariablesFour Categorical Variables• 51 States51 States
• 3 Grade Types3 Grade Types
• 3 Sale Types3 Sale Types
• 3 Formulation Types3 Formulation Types
One Magnitude VariableOne Magnitude Variable
One Sample Weight VariableOne Sample Weight Variable
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Comparative Evaluation of Cell Comparative Evaluation of Cell Suppression MethodsSuppression Methods
Classical Cell Suppression
• 294 Suppressions
• Sensitive Cells Fully Protected
Network Flow Method
• 479 Suppressions
• Sensitive Cells Fully Protected
• 3 exact Disclosures of non-sensitive cells
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CTA vs NOISE - TABULAR DATA QUALITY
14321432 633633
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