SDC too used: sdcTable
Version Used : 0.31
Operating system used: Windows 10
My colleague, Tim Linehan, and I, came across this when testing different suppression methods on Business data.
Below we replicate the scenario using synthetic data.
Issue Details
Some 2-digit NACE groups were primary suppressed due to the (2,80) dominance rule. However, in these suppressed NACE groups (B05, B06 and B07), the largest EN is still greater than 80% / 90% of their combined total and so requires some form of additional secondary suppression to avoid approximate disclosure.
B08 and B09 are the 2 NACE groups remaining which may be selected for suppression. B08 ideally should be selected. If B09 is suppressed then the dominant enterprise is still contributing more than 85% of the combined turnover of the suppressed groups.
This issue is currently tested for and picked up by a bespoke SAS program in use in the relevant Business area.
While we would not expect the Simplehuristic method to pick this up it would be expected that the Hypercube and perhaps HITAS methods would.
Sample data
In the accompanying sample synthetic data (samp_synth_data.csv - note: saved as a .xlsx file for the purposes of loading on this page) we have the following:
• Three NACE groups (B05, B06 and B07) at 2-digit NACE level which require primary suppression due to (2,80) dominance rule.
• Turnover for EN00000035 > 90% of combined turnover of the suppressed groups B05, B06 and B07 (i.e. EUR99500 > 90% of EUR110350)
Results
The following is a summary of the results we would expect to get and the results we got when using the different sdcTable secondary suppression methods:
Conclusion
Approximate disclosure, given the above scenario, would still be an issue following primary and secondary suppression (above methods) using sdcTable.
samp_synth_data.xlsx
SDC too used: sdcTable
Version Used : 0.31
Operating system used: Windows 10
My colleague, Tim Linehan, and I, came across this when testing different suppression methods on Business data.
Below we replicate the scenario using synthetic data.
Issue Details
Some 2-digit NACE groups were primary suppressed due to the (2,80) dominance rule. However, in these suppressed NACE groups (B05, B06 and B07), the largest EN is still greater than 80% / 90% of their combined total and so requires some form of additional secondary suppression to avoid approximate disclosure.
B08 and B09 are the 2 NACE groups remaining which may be selected for suppression. B08 ideally should be selected. If B09 is suppressed then the dominant enterprise is still contributing more than 85% of the combined turnover of the suppressed groups.
This issue is currently tested for and picked up by a bespoke SAS program in use in the relevant Business area.
While we would not expect the Simplehuristic method to pick this up it would be expected that the Hypercube and perhaps HITAS methods would.
Sample data
In the accompanying sample synthetic data (samp_synth_data.csv - note: saved as a .xlsx file for the purposes of loading on this page) we have the following:
• Three NACE groups (B05, B06 and B07) at 2-digit NACE level which require primary suppression due to (2,80) dominance rule.
• Turnover for EN00000035 > 90% of combined turnover of the suppressed groups B05, B06 and B07 (i.e. EUR99500 > 90% of EUR110350)
Results
The following is a summary of the results we would expect to get and the results we got when using the different sdcTable secondary suppression methods:
Conclusion
Approximate disclosure, given the above scenario, would still be an issue following primary and secondary suppression (above methods) using sdcTable.
samp_synth_data.xlsx