pdNickname is a unique nearly 50,000 record database designed to facilitate comparing sets of first name data based on nicknames, diminutives, pet names, variations and given names. One of the most important fields in the database product is RELFLAG, which stands for “Relationship Flag”.
The RELFLAG field contains one of two possible values:
1 = Close relationship between the name and variation (common variants): Includes closely associated nicknames, diminutives and pet names as well as first name variations that are considered closely related.
2 = More distant relationship between the name and variation (less common variants): Includes alternate forms of the names, often deriving from another culture, as well as nicknames, diminutives and pet names that are relatively uncommon.
PDNICKNAME VARIATIONS FOR THE GIVEN NAME
The RELFLAG field indicates if the name and variation have a (1) close or (2) more distant relationship.
The RELFLAG field is useful for controlling what is to be considered an acceptable match. As more distant relationships are included in matches, the error rate naturally rises. The error rate increase is usually not substantial, but it is measurable in hundredths and tenths of a percent.
RESIDENTIAL: While additional accuracy can be achieved if only close relationships are considered, with residential lists, the margin of error rate increase is almost always very small even when the more distant relationships are included—rarely more than 0.02% in our testing. Therefore, under best practices, it is fully acceptable to use all RELFLAG relationships when matching residential lists. With the exception of the George Foreman family, most errors that might occur result from different given name that share the same nickname or other variation.
BUSINESS AND ORGANIZATION LISTS: On the other hand, with business and organization lists, when the more distant relationships are included the margin of error rate increase is typically higher, compared to residential lists. However, our testing normally shows an increase that is still less than 0.1%, but we have seen it as high as 0.3% with some large lists. Under best practices, it is recommended that only close relationships be considered when processing business and organization lists.