• Data reference period
• Geographic localization (Município - 2013)
• Type of construction

• DWELLING:  Separate and independent place which, by the way it was built, rebuilt, enlarged, transformed or is being used, is intended for housing with the condition that it is not being used for other purposes at the time of reference: by separate it is meant that it is surrounded by conventional walls or other type, is covered and allows a person or group of persons to sleep, prepare meals or shelter from the weather separately from other members of the community; by independent it is meant that its occupants do not have to cross other accommodations to enter or leave the accommodation where they live.
• REFERENCE PERIOD:  The length of time for which data are collected, e.g. a specific day, month or year.

• Data reference period
• Geographic localization (NUTS - 2013)
• Category of housing unit
• Tax residence of the purchaser
• Institutional sector of the purchaser

• HOUSEHOLD DWELLING:  Dwelling that is normally intended to accommodate only one family, on the condition that it is not being used for other purposes at the period of reference.
• TAX RESIDENCE:  Place of habitual residence for natural persons, place of the head office or effective management for legal persons or, failing that, the place of their permanent establishment in Portugal.
• TRANSAÇÃO:  Operação pela qual se transfere a posse de um bem mediante uma contrapartida.
• INSTITUTIONAL SECTOR:  Institutional units with a similar type of economic behaviour are grouped into institutional sectors. Institutional units are classified in sectors on the basis of the type of producer they are and depending on their primary activity and function, which are considered indicative of the units' economic behaviour. A sector is divided into sub-sectors according to its own criteria, which makes for a more accurate description of the units' economic behaviour. Each institutional unit belongs to a single sector or sub-sector.
• REFERENCE PERIOD:  The length of time for which data are collected, e.g. a specific day, month or year.

`NTRANSj = sum_(i=1)^(n) NTRANSij`

                      NTRANSij, Number of transactions of dwelling i in quarter j

• Data reference period
• Geographic localization (NUTS - 2013)
• Category of housing unit
• Tax residence of the purchaser
• Institutional sector of the purchaser

• INSTITUTIONAL SECTOR:  Institutional units with a similar type of economic behaviour are grouped into institutional sectors. Institutional units are classified in sectors on the basis of the type of producer they are and depending on their primary activity and function, which are considered indicative of the units' economic behaviour. A sector is divided into sub-sectors according to its own criteria, which makes for a more accurate description of the units' economic behaviour. Each institutional unit belongs to a single sector or sub-sector.
• TRANSAÇÃO:  Operação pela qual se transfere a posse de um bem mediante uma contrapartida.
• HOUSEHOLD DWELLING:  Dwelling that is normally intended to accommodate only one family, on the condition that it is not being used for other purposes at the period of reference.
• TAX RESIDENCE:  Place of habitual residence for natural persons, place of the head office or effective management for legal persons or, failing that, the place of their permanent establishment in Portugal.
• REFERENCE PERIOD:  The length of time for which data are collected, e.g. a specific day, month or year.

`VTRANSj = sum_(i=1)^n VTRANSij ` 

                      VTRANSij, Value of transactions of dwelling i in quarter j