1.1 - 8.10 - FellegiSunter Syntax Elements - Teradata Vantage

Teradata Vantage™ - Machine Learning Engine Analytic Function Reference

Product
Teradata Vantage
Release Number
1.1
8.10
Release Date
October 2019
Content Type
Programming Reference
Publication ID
B700-4003-079K
Language
English (United States)
ComparisonFields
Specify the columns of InputTable to use in the field-pair similarity in the training process. If the value in the column is less than threshold_value, the field pair does not agree; otherwise, the field pair agrees.
Default behavior: The threshold_value of each field is 1.
TagColumn
[Optional] If you specify this syntax element, the function uses supervised learning; if you omit it, the function uses unsupervised learning.

This syntax element specifies the name of the column that indicates whether two objects match. The column must contain only the values 'M' (matched) and 'U' (unmatched).

InitialM
[Optional] For unsupervised learning, this syntax element specifies the initial value of m, which is the probability that a field agrees, given that the object-pair belongs to the same object. For supervised learning, the function ignores this syntax element.
Default: 0.9
InitialU
[Optional] For unsupervised learning, this syntax element specifies the initial value of u, which is the probability that a field agrees, given that the object-pair belongs to a different object. For supervised learning, the function ignores this syntax element.
Default: 0.1
InitialP
[Optional]
For unsupervised learning, this syntax element specifies the initial value of p, which is the percentage of all possible object-pairs that contain the same object. For supervised learning, the function ignores this syntax element.
Default: 0.1
MaxIterNum
[Optional] For unsupervised learning, this syntax element specifies the maximum number of iterations. For supervised learning, the function ignores this syntax element.
Default: 100
Eta
[Optional] For unsupervised learning, this syntax element specifies the tolerance of the termination criterion. At the end of each iteration, the function computes the difference between the current value of p and the value of p at the end of the previous iteration. If the difference is less than eta_value, the function terminates.
Default: 1*10-5
Lambda
[Optional]
Specify the Type I (false negative) error, which occurs if an unmatched comparison is erroneously linked.
Default: 0.9
Mu
[Optional] Specify the Type II (false positive) error, which occurs if a matched comparison is erroneously not linked.
Default: 0.9
Lambda and Mu determine the values of the model properties lower_bound and upper_bound. For details, see: Fellegi, Ivan; Sunter, Alan (December 1969). "A Theory for Record Linkage" Journal of the American Statistical Association 64