• Data reference period
• Place of residence (Portugal)
• Highest completed level of education

• RESIDENT POPULATION:  Set of persons who, regardless of being present or absent in a given housing unit at the moment of observation, have lived in the place of their usual residence for a continuous period of 12 months prior to the moment of observation, or have arrived to the place of their usual residence during the period of 12 months prior to the moment of observation, with the purpose of living there for a year, at least.
• EDUCATIONAL QUALIFICATIONS:  The degrees, diplomas, certificates, professional titles and so forth that an individual has acquired by study.
• 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).
• ELECTRONIC COMMERCE:  Business process conducted via Internet Protocol-based networks or via other computer-mediated networks. The goods and services are ordered over those networks, but the payment and the ultimate delivery of the good or service may be conducted on or off-line. Orders received via telephone, facsimile, or manually typed e-mails are not counted as electronic commerce.

(Persons aged between 16 and 74 years old using e-commerce for private purposes in the 12 months prior to the interview / Residente Population aged between 16 and 74 years old)*100