Capture-recapture as a tool for programme evaluation

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Abstract
Editor,--The capture-recapture technique described by Ronald LaPorte1 may be particularly useful in studying marginalised or inaccessible groups to assess the size and characteristics of the target population and the proportion in contact with services. For example, Fisher et al used a capture-recapture analysis of individual patterns of contact with homeless agencies in north east West-minster to estimate the total number of homeless people.2 They also used the data to determine use of services and concluded that, during …