• Data reference period
• Geographic localization (Portugal)
• Type of good, product by activity (CPA 2008)

• REGION OF DESTINATION:  Region, among the regions of the importing Member State, where the goods are to be consumed or undergo assembly, combination, processing, repair or maintenance operations; in its absence, the region of destination is replaced by the region where the marketing process is to take place, or by the region to which the goods are dispatched
• REGION OF ORIGIN:  Region, among the regions of the exporting Member State, where the goods were produced or were assembled, combined, processed, repaired or maintained; in its absence, the region of origin is the region where the marketing process took place or the region from which the goods were dispatched.
• EXPORT:  Physical movement of incoming goods/merchandise from the statistical territory of a Member State to the statistical territory of another Member State or a third country.
• 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).
• GOOD:  Any material object produced and placed on the market.

Price index = [(Sum P1*Q1) / (Sum P0*Q1)]*100-100

P1 - price of the year N; Q1 - Quantities of the year N; P0 - Price of the year N-1

N reference period in the year N

N-1 reference period in the previous year (N-1)