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  2. COVID-19 testing - Wikipedia

    en.wikipedia.org/wiki/COVID-19_testing

    Individual jurisdictions have adopted varied testing protocols, including whom to test, how often to test, analysis protocols, sample collection and the uses of test results. [ 6 ] [ 7 ] [ 8 ] This variation has likely significantly impacted reported statistics, including case and test numbers, case fatality rates and case demographics.

  3. Meta-analysis - Wikipedia

    en.wikipedia.org/wiki/Meta-analysis

    Results from studies are combined using different approaches. One approach frequently used in meta-analysis in health care research is termed 'inverse variance method'. The average effect size across all studies is computed as a weighted mean, whereby the weights are equal to the inverse variance of each study's effect estimator. Larger studies ...