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BMJ 2005;331 (29 October), doi:10.1136/bmj.331.7523.0-b
The UK government has set targets for reducing the rates of MRSA infection in hospitals, but it is unclear how these targets translate into tracking the performance of individual trusts. On page 1013 Spiegelhalter discusses how effects of chance variability, regression to the mean, and low power to detect genuine changes may hamper efforts to measure the change in rates. He proposes several ways for improving the assessment of performance.
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