Methodology & Data Sources

Last reviewed: October 7, 2026

Every WorldDataRank story should identify what is compared, where, in which year, and in what units. The article’s own methodology and source link are the authority for its exact indicator, country set and coverage.

Sources and reference years

We retrieve observations from the named source, commonly the World Bank Indicators API for country comparisons. The article links to the dataset or source endpoint when available. Its data year is the period measured; its refresh date records when the information was retrieved or the article was refreshed. Those dates are not interchangeable.

Coverage and missing values

Each ranking uses a defined comparison group and a minimum coverage rule. We select a common reference year that meets that story’s rule. Missing observations are not imputed, interpolated or treated as zero. Articles should identify coverage and relevant exclusions so readers can understand the scope.

Ranking and statistics

Ranking direction depends on the indicator and is stated in the article. A higher value is not automatically a better outcome. Exact source values determine order; display rounding is for readability. Ties are handled consistently as described in the story’s technical details. Means and medians are usually unweighted across the reporting countries unless the article states otherwise.

Validation and limitations

Automated checks verify the source response, metric identity, units, periods, entity uniqueness, numeric values, coverage and article structure. Human review checks the resulting article before publication. Providers can revise historical series, and country definitions or reporting practices can differ. A selected-country comparison is not necessarily a complete global ranking and does not establish causes.

For how we prepare and review stories, see the Editorial Policy. To report a suspected issue, see the Corrections Policy.