Researchers got it right in estimating numbers of doctors lost from NHS

doi:10.1136/bmj.319.7209.579

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Michael Goldacre, unit director,
Trevor Lambert, statistician (trevor.lambert@dphpc.ox.ac.uk)

UK Medical Careers Research Group, Oxford University, Oxford OX3 7LF

EDITOR—Hall questions the independence of the two methods we used to identify doctors working in the NHS and therefore questions the results obtained by our use of capture-recapture analysis.1 2 He assumes that both methods depend on doctors' propensity to respond to inquiries. They do not.

We identified doctors working in the NHS by using two fundamentally different approaches. In both cases, the …