Probabilistic record linkage and a method to calculate the positive predictive value.

Abstract:

BACKGROUND:Computerized record linkage is commonly used in cohort studies to ascertain the study outcome, and as such its accuracy classifying the outcome can be described using the standard epidemiological terms of sensitivity and positive predictive value (PPV). METHOD:We describe a 'duplicate method' to calculate the PPV of record linkage when each record can only be involved in one match (e.g. linking population files to death files). The method does not require a validation subset of records from both files with detailed personal information (e.g. name and address), and is therefore ideal for linkage projects using anonymous data. The duplicate method assumes that the number of records from one file with zero, one, two, etc., links from the other file is distributed in a manner predicted by combinatorial probabilities. Having made this assumption, the number of false positive links, and hence the PPV, are estimable. We demonstrate this duplicate method using output from anonymous and probabilistic record linkage of census and mortality records in New Zealand. RESULTS:The PPV estimates conform to the pattern expected based on the underlying theory of probabilistic record linkage, and were robust to sensitivity analyses. We encourage other researchers to further assess the accuracy of this method.

journal_name

Int J Epidemiol

authors

Blakely T,Salmond C

doi

10.1093/ije/31.6.1246

keywords:

subject

Has Abstract

pub_date

2002-12-01 00:00:00

pages

1246-52

issue

6

eissn

0300-5771

issn

1464-3685

journal_volume

31

pub_type

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