strsubcodechain Portugal Consumer price indices - Data and Methods
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Subjects > Consumer price indices > Portugal

Country: Portugal Subject: Consumer Price Index

PRT.CP.......
Direct source
National Institute of Statistics of Portugal (INE).
Related Links: INE


Unit of measure used
  • Index
  • Percentage change on the same period of the previous year
  • Percentage change on the previous period.


  • Sampling
  • Sample size: The number of outlets is approximately 16,370. The total number of prices monthly computed is, on average, 138,880.
  • Sampling technique: Both the Outlet selection and Item selection are carried out using non probabilistic sampling methods. In particular, the retail outlets are selected according to the quotation defined to each town. Within each town the type of outlets, the geographical distribution and the volume sellers are considered. Regarding the Item selection, the items selected result of the Households Budget Surveys. The market brands and the characteristics of the products are a result of a market research.


  • Base period
    The national reference year is 2008=100.

    Geographic coverage
    The index covers the entire country of Portugal (included the Madeira and the Azores islands).
    The CPI is released monthly for the following geographical areas: National, Mainland, Azores and Madeira.

    Institutional coverage
    Institutional households are excluded.

    Item coverage
    The basket covered by the index comprises of 902 products, grouped into the 12 COICOP divisions. On average 138,880 prices are considered monthly, from approximately 16,370 retail outlets.

    Population coverage
    The index covers all households irrespective of income, except institutional households, since the weight for this category is under the limit from the criteria of inclusion.

    Key statistical concept
  • The index measures the monthly changes in the general level of prices of goods and services bought by private households.
  • Types of prices: The prices included are the transaction prices actually paid by consumers. Prices include VAT and other taxes, as well as special offers (i.e. rebates and discounts, if the products are in good condition and they are not part of a total liquidation).
  • Price collection methods: The method used for price collection is the personal visit, using paper collection forms. The rent prices are collected directly from households, using the same methodology or by phone interview. Administrative prices are centrally collected, by phone or internet. Prices for used cars are collected through specialized magazines. The prices are collected in 41 Towns spread out by all of the country. The criterion of selection is the demographic weight.
  • Treatment of Rentals for Housing: Only Actual rentals for housing are included. No imputed prices are considered.
  • Treatment of Owner-Occupied Housing: Excluded. 
  • Treatment of missing prices: Missing prices are estimated according to the average increase verified in the same Town, same type of outlets, for a same product. 
  • Treatment of quality changes: Overlap (it is assumed that the new product has the same price trend that the previous one), bridged overlap, and reference variable method.
  • Introduction of new items: New products are introduced whenever there is enough information to decide for the inclusion in the sample and for the re-weighting.
  • Selection of replacement items: The process for selection of replacement items is a market research, based on the variety characteristics.
  • Seasonal items: Until December 2003: Seasonal food products have an average annual weight and a base price (annual average of prices in the base year. The product index for each month is computed taking into account the annual base price. Since January 2004: the index is annually chained, taking December previous year as the base period. The last observed price is maintained when the product disappears from the market. The index for seasonal products is computed in the same way as for the other products in the basket. The results show the price seasonal pattern. 


  • Classification(s) used
    COICOP (Classification of Individual Consumption According to Purpose)

    Aggregation and consolidation
  • Elementary aggregates (EA): The elementary prices for the i-th variety are calculated for a regional level and subsequently for a national level. At a regional level, the elementary index corresponds to the results collected from comparing the average regional prices in month t with that of the base period (until December 2003: annual average 2002; since January 2004: December previous year).
  • Index Formula: The Consumer Price Index (CPI) is calculated using a chained Laspeyres type index.


  • Weights
  • Source of weights: The weights are derived from the Households Budget Surveys (HBS), National Accounts data and from administrative information.
  • Time period of current weights: Weights are a result of the Households Budget Survey carried out in year 2000 updated with 2002 average prices. From January 2004 the index is chained annually, allowing for new goods and services to be brought in at the end of each year using data sources other than HBS.
  • Frequency of weight updates: The weights are revised every year based on National Accounts data and in relevant administrative information if it is available. If no additional information is available weights are price updated to December previous year.


  • Seasonal adjustment
    No seasonal adjustment is applied to the CPI.


    Country: PORTUGAL
    Subject: Consumer Price Index > All items > Total > Total


    PRT.CPALTT01.......
    Direct source
    The series is provided directly by the INE with 2008=100 as reference year for data from January 2008 onward.
    The series starts in January 1955.

    Item coverage
    COICOP from 01 to 12.

    Classification(s) used
    COICOP (Classification of Individual Consumption According to Purpose)


    Country: PORTUGAL Subject: Consumer Price Index > Goods > Food > Food (excl restaurants)

    PRT.CPGDFD02.......
    Direct source
    The series is provided directly by the INE with 2008=100 as reference year for data from January 2008 onward.
    The series starts in January 1960.

    Item coverage
    The series is consistent with the COICOP division 01 from January 1991 and excludes restaurant meals, alcoholic beverages and tobacco.

    Classification(s) used
    COICOP 01: Food and non alcoholic beverage.

    Weights

    Related Links: National CPI weights database



    Country: PORTUGAL Subject: Consumer Price Index > OECD Groups > Energy (Fuel, electricity & gasoline) > Total

    PRT.CPGREN01.......
    Direct source
    The series is provided directly by INE. The series starts in January 1948.

     



    Item coverage
    Energy includes electricity, gas, other fuels and gasoline. It excludes water.

    Classification(s) used
    COICOP 04.5: Electricity, gas and other fuels and 07.2.2: Fuels and lubricants for personal transport equipment.

    Weights

    Related Links: National CPI weights database



    Country: PORTUGAL Subject: Consumer Price Index > OECD Groups > All items non-food non-energy > Total

    PRT.CPGRLE01.......
    Direct source
    The series is computed by OECD using weights and components provided by the INE with 2008=100 as reference year for data up to December 2011. As of data from January 2012 series is reported by INE. The series starts in January 1970.

    Item coverage
    All items less food less energy is derived from the All Items Index and its components Food and Energy.  It excludes Food, non-Alcoholic beverages, electricity, gas, other fuel and gasoline. It includes restaurant meals, alcoholic beverages, tobacco and water.

    Classification(s) used
    COICOP 01, 04.5, 07.2.2

    Other manipulations

    Related Links: National CPI weights database



    Country: PORTUGAL Subject: Consumer Price Index > Services > Rent, imputed rent, repairs & maintenance > Rent, repairs & maintenance

    PRT.CPSEHO05.......
    Direct source
    The series is provided directly by the INE with 2008=100 as reference year for data from January 2008 onward.
    The series starts in January 1991.

    Item coverage
    The series includes actual rentals for housing and Maintenance and repair of the dwelling.

    Classification(s) used
    COICOP 04.1: Actual rentals for housing, 04.3: Maintenance and repair of the dwelling.

    Weights

    Related Links: National CPI weights database



    Country: PORTUGAL Subject: Consumer Price Index > Services > Services less housing > National definition

    PRT.CPSELR02.......
    Direct source
    The series is provided directly by the INE with 2008=100 as reference year for data from January 2008 onward.
    The series starts in January 1991.

    Item coverage
    Services excluding Actual rentals for housing and Maintenance and repair of the dwelling.

    Classification(s) used
    The series is derived from the Services and Housing series

    Weights

    Related Links: National CPI weights database