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Table 3 Methods of calculating risk categories and weights

From: Direct risk standardisation: a new method for comparing casemix adjusted event rates using complex models

Creating categories of risk Weights for combining risk category specific event rates for each centre
Equal width: 0.0-0.1, 0.1-0.2, 0.2-0.3, etc. Equal
Equal numbers of patients in each Proportion of all patients in each category
Equal numbers of observed deaths in each Proportion of all observed deaths in each category
Equal numbers of predicted deaths in each Proportion of all predicted deaths in each category