• Data reference period
• Geographic localization (Portugal)

• TOTAL POPULATION:  All persons, national or foreign, who are permanently settled in the economic territory of the country, on a given date, even if they are temporarily absent from it.
• GROSS DOMESTIC PRODUCT:  Final result of the production activity of resident producer units and it can be defined in three ways: production approach, expenditure approach and income approach.
• REFERENCE PERIOD:  Period to which the information refers and which may be a specific day or a time interval (month, fiscal year, calendar year, among others).

Sum of the absolute differences between regional (NUTS 3 level) and national GDP per inhabitant, weighted by the regional share of population.