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 …
[1] S. Pathak. The way I see it: Working in the Caribbean in the gap between basic and higher surgical training , 2002 .
[2] Tom Marshall,et al. Performance league tables: the NHS deserves better , 2002, BMJ : British Medical Journal.
[3] Tom Marshall,et al. Bristol, Shipman, and clinical governance: Shewhart's forgotten lessons , 2001, The Lancet.
[4] S Gallivan,et al. Mortality rates after surgery for congenital heart defects in children and surgeons' performance , 2000, The Lancet.