The FRSTNAME routine compares two first names, assuming fields are left-justified and blank-filled. If the two fields do not match exactly, the routine calculates two field lengths by excluding trailing blanks.
|
Score |
Description |
|---|---|
|
100 |
Exact match (excluding blank versus blank). |
|
99 |
Blank field value versus blank field value. |
|
98 |
Blank field value versus anything. |
|
95 |
Shorter field value is one character in length and it equals the first character of the longer field: for example, J versus John. |
|
90 |
If shorter field value is greater than one character in length and it is an exact starting substring of the longer field: for example, Jo versus Jo-Anne. |
|
80 |
If there is a mismatch of the first characters of both fields. |
|
The following logic is applied to further narrow the match. Based on this logic, the values are deducted from a ‘95’ score: |
|
|
Deduct from 95 |
Reason for Deduction |
|
– 2 |
For character errors (transposition, insertion, mismatch, extra characters at the end of either field after taking insertions into consideration). |
|
– 10 |
If number of character errors is more than 25% of the length of the longer field. |
|
– 25 |
If the character errors is more than 50% of the length of the longer field. |
No additional scoring deductions occur if:
- There is only one error and one extra character difference between the two fields
- There is only a one character difference in the lengths of the two fields
- Only the first field is greater than 5 characters in length. Use the Symetric modifier if you want to prevent a scoring deduction when either or both fields are more than 5 characters.