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Table 1 Reconceptualizing the known-unknown matrix as types of meta-analytic outcome data

From: Locating unregistered and unreported data for use in a social science systematic review and meta-analysis

 

Registered

Unregistered

Reported

Registered-reported (known-known)

Found by usual systematic review processes; extracting reported summary statistics

Unregistered-reported (unknown-known)

Found by reference harvesting; searching data repositories

Unreported

Registered-unreported (known-unknown)

Found by requesting known missing data; estimating effects from other reported data; using alternative information sources

Unregistered-unreported (unknown-unknown)

Found by “imputing” hypothetically missing data; contacting authors of potentially related studies

  1. Terminology in parentheses was the original from known-unknown matrix; found by indicates methods to locate the four types of meta-analytic data
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Systematic Reviews

ISSN: 2046-4053