Article Text
Letter to the editor
Funnel plots for institutional comparison
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Mohammed and colleagues1,2 have suggested the use of Shewhart control charts as a means of presenting performance indicator results without spurious ranking into “league tables”. They choose to plot the observed number of events against the volume of cases on a square root scale; unfortunately this choice appears unintuitive, obscures the observed event rates, and leads to rather approximate control limits. A …
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Copyright 2002 Quality and Safety in Health Care