Table 2.
Examples of the blocking process for the Damerau-Levenshtein distance (DLD)–based matching algorithm.
| FNMDa birth date | FNMD first name/surname concatenationb | Local database birth date | Local database first name/surname concatenationb | Comparison during birth date blocking | Comparison during first name/family name concatenation blocking |
| 1935-06-29 | louidefu | 1935-06-29 | louidefu | Yes | Yes |
| 1935-06-29 | louidefu | 1931-10-08 | maricall | No | No |
| 1935-06-29 | louidefu | 1940-26-11 | jeanpoku | No | No |
| 1935-06-29 | louidefu | 1956-23-12 | chardegu | No | No |
| 1956-12-18 | maricall | 1935-06-29 | louidefu | No | No |
| 1956-12-18 | maricall | 1931-10-08 | maricall | No | Yes |
| 1956-12-18 | maricall | 1940-26-11 | jeanpoku | No | No |
| 1956-12-18 | maricall | 1956-23-12 | chardegu | No | No |
| 1940-11-26 | jeanpoqu | 1935-06-29 | louidefu | No | No |
| 1940-11-26 | jeanpoqu | 1931-10-08 | maricall | No | No |
| 1940-11-26 | jeanpoqu | 1940-11-26 | jeanpoku | Yes | No |
| 1940-11-26 | jeanpoqu | 1956-23-12 | chardegu | No | No |
| 1940-11-26 | maricuri | 1935-06-29 | louidefu | No | No |
| 1940-11-26 | maricuri | 1931-10-08 | maricall | No | No |
| 1940-11-26 | maricuri | 1956-23-12 | chardegu | No | No |
| 1940-11-26 | maricuri | 1956-23-12 | chardegu | No | No |
aFNMD: French National Mortality Database.
bConcatenation of the 4 first characters of the first name and the 4 first characters of the surname (birth surname if present, current surname elsewhere).