Skip to main content

Table 1 Traditional match weights, match weights incorporating dependence between identifiers, and attribute-specific match weights according to agreement pattern {date of birth, sex, postcode}. Record pairs with no agreement on any identifiers, or where only sex agreed (agreement patterns {000} and {010}), were assumed to be non-matches and excluded

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

   Agreement pattern {date of birth, sex, postcode}
001 100 011 101 110 111
N Matches   1 21 18 12 15,924 14,009
N Non-matches   259 414,307 248 4 415,888 10
Match probabilitya 0.0039 0.0001 0.0726 0.7500 0.0369 0.9993
Traditional match weight 5.3 −1.0 9.6 14.9 8.6 23.7
Match weight assuming dependence −0.5 −1.2 9.3 17.8 8.6 27.6
Attribute-specific match weight:       
Sex Female −1.7 −1.7 8.7 17.3 8.7 27.7
Male 0.4 −0.9 9.7 18.1 8.5 27.5
Age 0–1 years −0.5 0.1 8.6 18.5 9.2 27.6
5–6 years −0.2 −2.0 9.6 18.2 7.9 28.0
18–19 years −1.5 −2.6 9.5 16.2 8.3 27.2
Ethnicity Missing 2.7 0.3 10.8 19.5 8.5 27.6
White −1.3 −1.6 8.8 17.4 8.6 27.6
Mixed 1.8 −0.4 10.9 19.4 8.8 28.6
Asian −0.4 −2.3 10.4 16.9 8.6 27.8
Black 1.6 0.9 9.6 19.1 8.9 27.1
Other 1.4 −0.2 10.5 19.0 8.8 28.1
Organisational-specific match weight (mean) 5.7 1.3 12.3 20.7 8.1 25.4
  1. aMatch probability = N matches/Total record pairs