Statistics Poland

Trade and Services Department

00-925 Warszawa, al. Niepodleglosci 208

The OOHPI is based on the ‘net acquisitions’ approach, which measures changes in prices paid by households for the acquisition of dwellings that are new to the household sector and changes in other costs related to the ownership, and transfer of ownership, of dwellings.

The OOHPI is broken down into the following expenditure categories:

• O.1. Owner-occupiers’ housing expenditure;
  • O.1.1. Acquisitions of dwellings;
    • O.1.1.1. New dwellings;
      • O.1.1.1.1. Purchases of newly built dwellings;
      • O.1.1.1.2. Self-build dwellings and major renovations;
    • O.1.1.2. Existing dwellings new to households;
    • O.1.1.3. Other services related to the acquisition of dwellings;
  • O.1.2. Ownership of dwellings;
    • O.1.2.1. Major repairs and maintenance;
    • O.1.2.2. Insurance connected with dwellings;
    • O.1.2.3. Other services related to ownership of dwellings.

Households which are owner occupiers.

The main statistical variables are price indices.

The basic unit of statistical observation are transaction prices of dwellings new to the household sector and of other products that the households acquire in their role as owner-occupiers.

Owner occupied dwellings.

The entire country is covered in the survey and data are available only for the country as a whole.

Data are available quarterly starting with the first quarter of 2010.

The base period for OOH is 2015=100.

The following units are used:

- Index point;
- Percentage change on the same period of the previous year (rates);
- Percentage change on the previous period (rates);
- Percentage share of the total (weights).

OOHPI is a quarterly statistics.

National level:

Law on Official Statistics of 29 June 1995 (Polish legal act) with subsequent amendments.

Program of Statistical Surveys of Official Statistics (issued annually in Poland as Council of Ministers’ regulation) with reference to EU requirements.

OOHPI are transmitted quarterly to Eurostat for the categories mentioned under 3.2 above. The weights are transmitted once a year. There is no data sharing of OOHPI with any other organisation or entity.

All statistics collected and published by the CSO are governed by the Law on Official Statistics passed on 29th June 1995 with subsequent amendments. The question of confidentiality is explained in the art. 10 and 38 of the Law on Official Statistics.

European legislation:

Regulation (EC) No 223/2009 of the European Parliament and of the Council, of 11 March 2009, on the transmission of the data subject to statistical confidentiality to the Statistical Office of the European Communities.

Confidential data are treated in accordance with the policy described in concept 7.1.

Not applicable.

Not available.

The Polish OOHPIs are not disseminated yet at quarterly basis. They are publish in the annual publication "Prices in the national economy".

Quarterly (OOHPI) and annually (weights).

No information.

"Prices in the national economy" - annual edition (last in 2022). 

None.

Micro-data is not published.

No.

There are papers (internally available for the CSO’s staff) which discuss methodological issues of OOHPI and HPI and describe the data sources and also framework of compilation both indices by the Statistics Poland. They are based on the draft Technical Manual on Owner-Occupied Housing and House Price Indices.

Not available.

Documentation on procedures applied for quality management is available on the website: https://bip.stat.gov.pl/en/activity-of-public-statistics/quality-in-statistics/

In order to assure an appropriate quality of OOH price indices quality checks and validations are made throughout data collection as well as data processing process. Data are checked for completeness and consistency with statistical concepts and definitions.

Self-assessment based on the OOH Technical Manual is routinely carried out.

Eurostat/ECB. There is no information on specific user needs.

The scope of the data users satisfaction survey did not include the OOH so far. However, the objectives of the survey set out in the Programme of Statistical Surveys of Official Statistics are evaluated on an annual basis. User needs are systematically monitored and taken into consideration while drafting the "Programme of Statistical Survey of Official Statistics" for the next year. The organs of the state power, government and self-government administration, organizations of employers and other institutions, provide opinions on statistical surveys and recommend implementation of the new ones. Data users, e.g. universities, research institutes, enterprises or individuals may indicate their needs by data inquiries and orders.

OOHPI covers statistics required by the Regulation (EU) 2016/792.

Taking into account the availability of data sources and timeliness of existing data provision for the OOHPI calculation its accuracy is satisfactory.

Sampling errors are not calculated for OOH price indices because the survey is not based on random sampling.

There are efforts to reduce non-sampling errors through continuous methodological improvements, survey process improvements and validation methods which can help us to avoid coding and typing errors.

Non-response by regional statistical offices and overall non-response are calculated, and the causes of non-response are analysed.

No regular national dissemination (periodical publication), data is delivered to Eurostat on target date (works in progress on national publication).

Data is normally delivered according to the time schedule. The possible time lag between the actual delivery of the OOHPI to Eurostat and the target date when it should have been delivered is less than 5 days (depending on HPI data).

The OOHPI has no regional breakdown.

OOHPIs are comparable over-time for the whole period since they started to be regularly calculated by the Statistics Poland, i.e. first quarter of 2010. No series breaks for OOHPIs occurred since then.

Coherency of the OOHPIs in the light of outputs of other statistical domains is checked. It refers mainly to the HPI and the HICP (COICOP 04.3 Maintenance and repair of the dwelling) taking into account differences in coverage and methodology among these indices.

The OOHPI categories 'Purchases of newly built dwellings' and 'Existing dwellings new to households' are conceptually comparable with the HPI categories (H.1.1 and H.1.2). However the HPI does not follow the net-acquisition concept and the price of land is included in prices.

The total cost of the survey (number 1.64.09) is (in PLN) 664390. The OOHPI production do not involve respondent burden.

OOHPIs are revisable in line with Regulation (EU) 2016/792.

OOHPI data were revised and sent to Eurostat:

- in October 2015, due to introduction of the HPI breakdown to new and existing dwellings.

- in December 2021 and March 2022 (for Q2 and Q3 2021), due to changes in data series for insurances.

- in July 2022  (for Q1 2022), due to IT issues.

See below.

OOHPI is a type of index which is based on statistical data produced by the official statistics such as National Accounts, Producer Prices in Construction Industry, Consumer Prices, dedicated survey and HPI data. 

The main sources for the weights used to compile the OOHPI: National Accounts, data from the Register of Prices and Values of Real Estate.

Data collection is carried out on a quarterly and monthly basis.

Survey data is collected mainly by price collectors and centrally online. There are 207 price collectors on permanent basis. 

Accuracy, completeness and relevance of the data gathered for OOHPI purposes from other statistical domains are checked before input to the compilation system. The majority of these data pass quality tests and go through validation procedures before being processed in the sections responsible for particular survey. 

See below.

See below.

OOHPI is a Laspeyres-type price index.

In the case of the data collected by price collectors, the first step is to calculate an index for a particular item for each of the survey regions, i.e. unweighted price to price comparison (current month to previous month); next, the national index for a particular item is calculated, i.e. a geometric average of all indices from all survey regions, in the case of central collection, an index for a particular item is calculated, i.e. unweighted price to price comparison (current month to previous month). Aggregation of items into elementary aggregates (m/m-1 indices) the obtained price-to-price indices are then aggregated into the lowest levels of OOH classification, this is done with the use of the Jevons index (unweighted geometric mean of the price relatives – obtained in the previous stage, i.e. current month to previous month); we obtain the monthly price indices (the previous month = 100) for elementary aggregates. The next steps are: Dec t-1 indices for elementary aggregates. Monthly indices with the base of December of the previous year for elementary aggregates are calculated with the use of chain linking method with the use of m/m-1 indices m/Dec t-1 indices and recalculated into quarterly indices with the base 4Q t-1=100. HPI indices are added at the last stage of calculation. The OOHPI is chained on a yearly basis using the 4Q of the previous year as the linking period.

Weights:

• Constructed on the basis of the data  from National Accounts, Construction Industry Statistics and the Register of Prices and Values of Real Estate reviewed and updated to make them representative of year t-1
• Updated annually

Elementary aggregate weights are adjusted with an appropriate price change between the year t-1 and the fourth quarter of the year t-1.

The OOHPI is chained on a yearly basis using the fourth quarter of the previous year as the linking period. 

See below.

The price of the dwelling is the price in the notarial deed signed at the time when the ownership is transferred.

VAT is included in the price of newly built dwellings.

Other taxes are not included in the price of dwellings.

Sales of social dwellings to sitting tenants (usually at a large discount) are excluded from the index compilation.

The land value is excluded from the weights.

Housing cooperatives are not included.

The OOH sub-indices for purchases of newly built dwellings and existing dwellings new to households are based on HPI data. 

The OOH sub-indices for purchases of newly built dwellings and existing dwellings new to households are based on HPI data.

The OOH sub-indices for purchases of newly built dwellings and existing dwellings new to households are based on HPI data.

See below.

Jevons index, i.e. geometric average of the price relative is applied in order to calculate monthly price indices (the previous month = 100) for basic aggregates. Monthly indices with the base of December of the previous year for basic aggregates are calculated with the use of chain linking method with the application of indices with the previous month base. For O1111 and O112 we apply HPI quarterly indices. Price indices for elementary aggregates of OOHPI have the fourth quarter of the previous year as a price reference period. 

Price collectors are supervised and continuously controlled by the staff of the Regional Statistical Offices (RSOs).  Any replacements have to be commented upon and explained. If further quotation of the selected product is not possible anymore, then another one is chosen, whose features are in accordance with the item’s description. The selection criteria are the popularity of purchase and the stability of the assortment, i.e. ensuring the possibility to observe the prices of the substitute during a longer period of time. It is especially important in the case of services, where specifying the scope and the details connected with service provision is crucial. 

The OOHPI have different quality adjustment method due to composition based on different data sources. The OOH sub-indices for purchases of newly built dwellings and existing dwellings new to households follows HPI rules. Methods for Self-build dwellings and major renovations, Other services related to the acquisitions of dwellings, Major repairs and maintenance, Other services related to ownership of dwellings are similar to HICP rules. 

When the products are unavailable for short periods of time, the missing prices are estimated for maximum two consecutive quotation periods and these estimates are taken into account. The estimates are done by regional statistical offices based on the average price dynamics (geometric mean) in a given Voivodeship, if the number of the item's quotations is ≥ 3. If the number of quotations is ≤ 3, the estimates are made by the Price Statistics Centre in Opole based on data from all around Poland.

If the price is temporarily reduced, for example due to promotional sales and can be associated with a particular product, then the price is recorded. In addition, a discounted price may be collected only when it concerns a non-damaged product of full value, which has not exceeded its shelf life, for which a legitimate complaint can be filed, and the discounted price of which is not connected with the approaching expiry date. Out-of-season sales are taken into consideration if they concern products from the current season. If the price recorded is lower than the one recorded in the previous period, appropriate explanatory information is provided, in the form of text and adequate codes.

In the case of OOH there are no zero price cases.

VAT is included in the prices.

No seasonal or other type of adjustment is applied. 

Related Metadata: HICP, HPI, NA.