From: An efficient record linkage scheme using graphical analysis for identifier error detection
Identifier | Cardinality | Average NHS numbers per identifier |
---|---|---|
National Health Service Number | 1066339 | 1 |
Date of birth | 35694 | 29.87 |
Surname, complete forename | 829650 | 1.285 |
Surname, first letter of forename, date of birth | 1065027 | 1.001316 |
Surname, first three letters of forename, date of birth | 1066184 | 1.000234 |
Surname, complete forename, date of birth | 1066519 | 1.000090 |