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To allow comparisons across countries and over time, where possible the indicator tables in the Report are based on internationally standardized data, collected and processed by sister agencies in the international system or, in a few cases, by other bodies. These organizations, whether collecting data from national sources or through their own surveys, harmonize definitions and collection methods to make their data as internationally comparable as possible. The data produced by these agencies may sometimes differ from those produced by national sources, often because of adjustments to harmonize data. In a few cases where data are not available from international organizations particularly for the human development indices other sources have been used. These sources are clearly referenced in the tables.

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