3. Methodology
Irish Statistical System Code of Practice
The Statistics and Business Intelligence Unit of the Department, a part of the Irish Statistical
System, oversees the design, sample selection, analysis, and reporting of the Department’s fraud
and error surveys. The Chief Statistician ensures that these statistics are produced in an
objective, transparent and independent manner, in line with the requirements of the Irish
Statistical System Code of Practice
.
Survey principles
The Department, in agreement with the Comptroller & Auditor General (C&AG), applies the
following principles to the design and implementation of Fraud & Error surveys:
All cases for inclusion in the survey must be selected randomly from the population of
cases in payment at a specific time;
The sample size must be sufficiently large to yield reasonably reliable estimates;
The reviews should be carried out as promptly as possible;
Cases should be tested fully for all possible breaches of regulations;
The monetary values of any changes as a result of the review together with the
monetary value of the sample should be captured so that the results can be
extrapolated to draw conclusions about the estimated value of the loss; and
The results of the survey should be capable of being audited.
Sample selection
For the Household Benefits survey, the Statistics and Business Intelligence Unit matched the
Household Benefits recipient database against the recipient databases for the six primary
Department of Social Protection weekly payment schemes, resulting in matches for some 93% of
recipients (see Table 3 for details).
From the remaining cases, the Unit selected a stratified random sample of 500 Household
Benefits claims in payment at the start of November 2015 (‘the Fraud and Error sample’). It
verified that this sample was representative of the Household Benefits package (only) recipient
population profile.
This sample size was chosen in order to strike a right balance between the statistical power of
the survey and the resource-intensive nature of the inspections required.
Survey procedures
Each sample case was assigned to an Investigating Officer to conduct a full review of the claim.
Completed survey material and customer files were submitted for examination, assessment and
revised decision by a Deciding Officer in the Household Benefits Unit.
Categorisation of results
Fraud and Error rates were calculated based on the decisions of the Deciding Officer in each case
included in the survey sample.
Fraud or suspected fraud arises where it appears to the Deciding Officer that the
claimant knowingly gave false or misleading information or wilfully concealed relevant
information.
Error cases arise due to inadvertent customer, third party or official error.
These decisions were carefully reviewed by the Chief Statistician before arriving at a final
classification for each case.
http://www.isscop.ie/codeofpractice/