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If poverty rates are not available for all countries in a given year, how are global and regional poverty statistics calculated?

When survey data are not available for a particular year, poverty measures are interpolated and extrapolated from the nearest survey years using national accounts data. See the technical details on how annual poverty estimates are generated from less frequent survey data in the Poverty and Inequality Platform (PIP) Methodology Handbook.

Regional poverty rates are estimated as population-weighted averages of poverty rates in a given region. The global poverty rate is estimated as the population-weighted average of regional poverty rates. 

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