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Article

Measuring the inspectorate: point and interval estimates for performance indicators

Border-based regulatory inspectors, such as quarantine and customs organizations, intervene at national and state borders. Performance indicators can be used to help assess and compare non-compliance, and also to assess the inspectorate's ability to detect and rectify. We document a suite of three performance indicators that target inspectorate at and before the border, and provide protocols for collecting the necessary data to compute point estimates of the indicators. For proving interval estimates, we then discuss mathematical models that are present in the data collection. We cover three distinct setups, namely, the importation of certain classes of air cargo in Australia, both historically and under current policies, and passengers arriving at an international airport. The methodology developed here using the terminology of quarantine inspections can be applied in more general settings. Under the model, which best describes the way, data is collected, we provide confidence bounds for the performance indicators, with coverage close to the nominal level. The methodology is then illustrated on real and fabricated data.