منابع مشابه
Funnel plots for comparing institutional performance.
'Funnel plots' are recommended as a graphical aid for institutional comparisons, in which an estimate of an underlying quantity is plotted against an interpretable measure of its precision. 'Control limits' form a funnel around the target outcome, in a close analogy to standard Shewhart control charts. Examples are given for comparing proportions and changes in rates, assessing association betw...
متن کاملFunnel plots in meta-analysis
Funnel plots are a visual tool for investigating publication and other bias in meta-analysis. They are simple scatterplots of the treatment effects estimated from individual studies (horizontal axis) against a measure of study size (vertical axis). The name “funnel plot” is based on the precision in the estimation of the underlying treatment effect increasing as the sample size of component stu...
متن کاملFunnel plots for comparing institutional performance of antenatal care in pregnant women with diabetes.
Three audit indicators were summarised, relating to key standards of pre-pregnancy care: HbA1c, intake of folic acid and booking at less than 10 weeks gestation. Proportions were calculated from the total number of pregnancies notified at each unit. The funnel plots were plotted using the software developed by the Eastern Public Health Observatory [8]. Funnel plots were created showing units fa...
متن کاملUsing funnel plots in public health surveillance
BACKGROUND Public health surveillance is often concerned with the analysis of health outcomes over small areas. Funnel plots have been proposed as a useful tool for assessing and visualizing surveillance data, but their full utility has not been appreciated (for example, in the incorporation and interpretation of risk factors). METHODS We investigate a way to simultaneously focus funnel plot ...
متن کاملMeta-analysis, funnel plots and sensitivity analysis.
Publication bias is a major problem, perhaps the major problem, in meta-analysis (or systematic reviews). Small studies are more likely to be published if their results are 'significant' than if their results are negative or inconclusive, and so the studies available for review are biased in favour of those with positive outcomes. Correcting for this bias is not possible without making untestab...
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ژورنال
عنوان ژورنال: Quality and Safety in Health Care
سال: 2002
ISSN: 1475-3898,1475-3901
DOI: 10.1136/qhc.11.4.390-a