Transformations > Deduplicate transformation > Link scores and driver scores
  

Link scores and driver scores

The deduplication process adds a link score and a driver score data to the Deduplicate transformation output. You can use the scores to better understand the relationship between duplicate records.
The link score is the score between two records that identifies them as members of the same matching set. The transformation creates a link between a given record and the first record that it matches with a score above the threshold value.
The LinkId field identifies the records to which a link score applies. The link score and link ID values do not imply that a pair of records are the best match in the input data. The purpose of the link score and link ID values is to determine the composition of the matching record set.
The driver score is the score between the first record added to a matching record set and another record in the same set. The transformation uses the sequence ID or row ID values to identify the first record in the set. Driver scores provide a means to assess all records in the set against a single record.
Note: Duplicate analysis generates a single set of scores for the input records. The driver scores and link scores represent the different relationships between the records and do not indicate different types of duplicate analysis. The driver score and link score assignments can depend on the order in which the records enter the transformation. A driver score for a given pair of records might be lower than the threshold value.

Example of link scores and driver scores

A Deduplicate transformation analyzes a column of surname data. The deduplicate asset defines a threshold value of 0.825 for duplicate records.
The following table shows the results that the transformation might return:
Surname
Sequence ID
ClusterId
ClusterSize
DriverId
DriverScore
LinkId
LinkScore
SMITH
1
1
2
1 - 6
1
1 - 1
1
SMYTH
2
2
2
1 - 3
0.83333
1 - 2
1
SMYTHE
3
2
2
1 - 3
1
1 - 2
0.83333
SMITT
4
3
1
1 - 4
1
1 - 4
1
SMITS
5
4
1
1 - 5
1
1 - 5
1
SMITH
6
1
2
1 - 6
1
1 - 1
1
The results provide the following information about the surname data: