Statistics Portugal

Unit for the Coordination of Territorial Statistics

Avenida António José de Almeida, 1000-043 Lisboa, Portugal

The data collection provides information and comparable measurements on the different aspects of the quality of urban life in European cities and regions in support of EU policy initiatives on urban and rural development.

Specific classification and coding systems have been developed for the spatial units and for the variables and indicators. For the description of the coding system and the list of indicators and variables see the City statistics manual.

The indicators and variables cover several aspects of quality of life, for e.g. demography, housing, health, crime, labour market, educational qualifications, environment and travel patterns.

The definitons of the City statistics manual have been followed for most variables. Additional information on the deviating definitions used in the PT collection is provided in Annex 'PT Metainformation by variable'.

Statistical units are mostly persons. Few variables are collected on households, enterprises, dwellings, cities, etc. For the complete description of variables see the City statistics manual.

For most variables the target statistical universe is the usual residents of a geographical area (city or region). For the detailed description of variables see the City statistics manual.

Spatial Units are listed in Annex 'PT Spatial Units'. For information concerning the spatial dimension see the City statistics manual.

The data collection is organized in data collection rounds. The current data collection covers the reference years 2021-2022.

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The units of measures used for the data set are listed in the Annex of the City statistics manual.

2021, 2020, 2019, 2018, 2017, 2016, 2015, 2014, 2011, 2008, 2004 and 2001 are the reference years for the main data collection. 1996 and 1991 were the the reference years for the "historical" data collection. Few variables have been collected on annual bases for the period 2005-2013.

All data supply of urban statistics is based on a voluntary agreement, as there is no Community legislation on this topic.

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Regulation (EC) No 223/2009 on European statistics (recital 24 and Article 20(4)) of 11 March 2009 (OJ L 87, p. 164), stipulates the need to establish common principles and guidelines ensuring the confidentiality of data used for the production of European statistics and the access to those confidential data with due account for technical developments and the requirements of users in a democratic society.

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The periodicity of the data is 3-years. Few indicators are collected annually. The database is updated occasionally (on average quarterly) depending on the data availability of new and revised data.

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Data collected in such terms is being transmitted to the national authority on urban policy.

The definitons of the City statistics manual have been followed for most variables. Additional information on the deviating methodology used in the collection is provided in Annex 'PT Metainformation by variable'.

The quality assurance procedures detailed in the City statistics manual have been applied.

The collection of data is preceded by contacts with the national suppliers (different thematic units of NSI or other data providers) in order to evaluate the fulfillment of the methodologies defined. All the metainformation available in the City statistics manual, as well as the details of the variables are transmitted to the data providers. After collecting the data, all information is fully checked and compared with other dissemination formats of each thematic area, namely cross-domain coherence and internal coherence validations are carried out.

The quality of information is fully assessed in one hand using internal procedures and in the other hand through Eurostat validation methods.

User needs and stakeholder requirements are collected at several forums.

User needs and stakeholder requirements are collected at several forums. Comments and contributions are welcome to be sent to the contact.

For the variables of Labour Market the main source should be the Labour Force Survey, but these data are not sufficiently detailed to cover the spatial units of cities and FUA.

Metainformation and quality aspects of the variables collected is provided in Annex 'PT Metainformation by variable'.

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Depends on the domain and individual variable.  

Timetable of the project:

Start: 26th April 2022

- Report indicating the extent of harmonisation with European definitions and information on data definitions where harmonisation is not feasible: Completed on August 2022

- Validated dataset for the reference year 2021: Completed on September 2022

- Metadata file according to ESS standards: Completed on October 2022

- Interim technical report: to be completed on May 2023

- Validated dataset for the reference year 2022: to be completed on September 2023

- Updated Metadata file according to ESS standards: to be completed on October 2023

Due to some deviating definitions and different data sources used, the international comparability of data may be limited to some extent. Deviations form defintions have been identified accordingly (see metadata).

Detailed information on data sources and deviating definitions is available in Annex 'PT Metainformation by variable'.

The implementation of a fully comparable definition of cities and FUA at European level has improved the comparability.

Breaks in the time series are flagged accordingly (Flag B = break in time series).

Data collected in "Data collection for City and Subnational Statistics" is coherent with the data collected in the context of the European Statistical System. Detailed information on deviating  sources and definitions is available in the annex 'PT Metainformation by variable'.

Internal coherence (e.g. between spatial levels, between indicators like total, male, female population) is ensured through the application of multivariable and univariable validation controls.

The data collection is mostly based on data available in the National Statistical System. Some data is based on administrative registers or other data providers. Therefore, the main burden is on the Statistical Institute.

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Basic information on data sources is included in Annex 'PT Metainformation by variable'.

This is a multiannual data collection.
The reference period of the current data collection is 2021-2022.

The compilation of these urban and regional statistics has been coordinated by Statistics Portugal, where the National Urban Audit Coordinator (NUAC) is located. The main sources of data are the official thematic statistics and, therefore, the data collection involves several departments in Statistics Portugal. An effort is made to validate information in order to maintain temporal and territorial data coherence.

The main tasks concern:

- Exploring national methodologies and data sources and their coherence with manuals and ESS guidelines.

- Verifying the consistency between the data collected in the frame of this project and the data available at the upper NUTS levels and country level collected by Eurostat on a regular basis. Improving, if needed, the methodologies and guidelines to compute subnational variables compatible with the current legal frameworks and ESS guidelines.

- Compiling the variables required for City and Functional Urban Area levels.

- Estimating missing data, if possible, and provide documentation on the methods applied.

- Checking and validating the compiled data, preferably by using the EDIT tool provided by Eurostat.

- Transmitting the data via eDAMIS to Eurostat in a standardised format (csv comma delimited) and with the structure as provided by Eurostat. Data will be transmitted with the appropriate flags if compliance with definitions is not fully ensured.

- Checking the list of potentially erroneous data (elaborated by Eurostat) and clarify and correct the issues towards Eurostat if necessary.

- Providing metadata, a description of the data collected (e.g., data source, methodology used to estimate the variables, etc.), according to the web-application for metadata production and dissemination provided by Eurostat (ESS Metadata Handler), a ESS fully SDMX compliant tool to create and exchange metadata files.

The main steps of the project Data collection for City and Subnational Statistics are:

a. Report indicating the extent of harmonisation with European definitions and information on data definitions where harmonisation is not feasible

b. Validated datasets for the reference years 2021 and 2022

c. Metadata file according to ESS standards

d. Interim technical report

All the information requests sent to the different thematic units in NSI and to other data providers include the underlying definitions of the variables. After collecting the data, every information is fully checked and compared with other dissemination formats of each thematic area.
After the transmission of data to Eurostat, the participation in the quality control of variables and indicators takes place following Eurostat's data feedback.

All data is officially published in the National Statistical System or is based on administrative registers.

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