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

• GOOD:  Any material object produced and placed on the market.
• 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).
• 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.
• 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.

Volume index = [(Value index) / ( Price index)]*100-100