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Table 2 Simulation study results: estimated readmission rates. The ‘true’ readmission rate was 8.8%

From: Utilising identifier error variation in linkage of large administrative data sources

   NHS number error distribution in simulated data
   30%, random 0.5%, random 30%, associated with other identifier errors 30%, associated with ethnicity
Traditional match weight % readmitted 7.4 7.4 6.9 7.4
Standard error 0.002 0.002 0.002 0.002
% bias −15.9 −15.9 −21.3 −15.7
Match weight incorporating dependence % readmitted 7.4 7.4 6.9 7.4
Standard error 0.002 0.002 0.002 0.002
% bias −16.0 −16.0 −21.4 −15.8
Attribute-specific match weight % readmitted 8.7 8.7 8.7 8.8
Standard error 0.002 0.002 0.002 0.002
% bias −0.6 −0.6 −0.9 −0.2
Organisation-specific match weight % readmitted 8.8 8.8 8.8 8.8
Standard error 0.002 0.002 0.002 0.002
% bias 0.2 0.2 −0.1 0.2