LinkSolv 8.3 Help Pages and User Guide

Comparisons Tab

Comparisons Tab
1

Where am I?

1. Where am I?
 
Guidelines
 
Comparing Data Values. Match probabilities are determined by comparing data fields and determining whether data values on a pair of records agree, disagree, or are missing on one or both records. For many data fields, requiring exact agreement is too strict, causing an excessive number of missing links (false negatives). Most fields have some disagreements because of reporting errors such as misspelled names. In addition, some fields disagree because reported values are correct but different. For example, the location of a motor vehicle crash and the location of a hospital treating a crash victim usually would be correct but different. Field standardization is one way to reduce correct but different (1/1/2008 and 01/01/2008 are correct but different). The comparison methods listed here allow you to compute the difference between two values (a delta value) so that you can detect close values and correct for both types of error: incorrect values or correct but different values. The Test Compare Methods dialog does not affect any actual data -- it is only for interactive demonstrations. You will have to specify a comparison method and a tolerance range for agreements in your record linkage model for each pair of fields being compared.
 
2

Compare Method List

2. Compare Method List
 
Test. Click on the Test button to start the Test Compare Methods dialog for any Compare Method.
 
You can use any built-in Compare Method in your match field specification to test whether two data values are close using some appropriate measure.
 
Authored with help of Dr.Explain