CASE STUDY: Estimating the Completeness of a Mapping Database Statistical Analysis, Sampling and Estimation Client: Ordnance Survey Role: Egerton Consulting was appointed to review the existing method of sampling and estimation used to assess the level of completeness of mapping data held by the client. Result: A more economic sampling method was developed to achieve the required levels of accuracy, and new methods developed for the ecient estimation of several new performance measures. We have been applying the statistical model for measuring current performance you provided for us and we have run a pilot audit to allow direct comparison. The results produced to-date show that they compare very closely with each other. Steve Cowell Accreditation Manager Ordnance Survey

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