Revised Data

Official statistics are statistics published by government agencies or other public bodies such as international organizations as a public good. They provide quantitative or qualitative information on all major areas of citizens' lives, such as economic and social development, living conditions, health, education, and the environment.

During the 15th and 16th centuries, statistics were a method for counting and listing populations and State resources. The term ''statistics'' comes from the New Latin ''statisticum collegium'' (council of state) and refers to ''science of the state''. According to the Organisation for Economic Co-operation and Development, official statistics are statistics disseminated by the national statistical system, excepting those that are explicitly not to be official".

Governmental agencies at all levels, including municipal, county, and state administrations, may generate and disseminate official statistics. This broader possibility is accommodated by later definitions. For example:

Official statistics result from the ''collection and processing of data'' into statistical information by a government institution or international organisation. They are then disseminated to help users develop their knowledge about a particular topic or geographical area, make comparisons between countries or understand changes over time. Official statistics make information on economic and social development accessible to the public, allowing the impact of government policies to be assessed, thus improving accountability.

Aim

Official statistics provide a picture of a country or different phenomena through data, and images such as graph and maps. Statistical information covers different subject areas (economic, demographic, social etc.). It provides basic information for decision making, evaluations and assessments at different levels.

The goal of statistical organizations is to produce relevant, objective and accurate statistics to keep users well informed and assist good policy and decision-making.

Various categories

''The Fundamental Principles of Official Statistics'' were adopted in 1992 by the United Nations Economic Commission for Europe, and subsequently endorsed as a global standard by the United Nations Statistical Commission. According to the first Principle "Official statistics provide an indispensable element in the information system of a democratic society, serving the government, the economy and the public with data about the economic, demographic, social and environmental situation".

The categorization of the domains of official statistics has been further developed in the Classification of Statistical Activities, endorsed by the Conference of European Statisticians and various other bodies.

Most common indicators used in official statistics

Statistical indicators provide an overview of the social, demographic and economic structure of society. Moreover, these indicators facilitate comparisons between countries and regions.

For population, the main indicators are:
* Total population
* Population density
* Population by age
* Life expectancy at birth and at age 65
* Foreign born
* Foreigners in population
* Total fertility rate
* Infant mortality

The gender statistics include:
* Women in labour force
* Gender pay gap

In the employment category:
* Employment rate
* Unemployment rate
* Youth unemployment rate
* Economic activity rate (women and men)
* Employment in major sectors: agriculture, industry, services

There are many indicators for the economy:
* Gross Domestic Product
* Gross Domestic Product per capita
* Real GDP growth rate
* GDP by major economic sectors: agriculture, industry, services
* Consumer price index
* Purchasing Power Parity
* Exchange rate
* Gross external debt

For trade indicators we find:
* Exports of goods and services
* Imports of goods and services
* Balance of payments
* Trade balance
* Major import partners
* Major export partners

Environment indicators:
* Land use
* Water supply and consumption
* Environmental protection expenditure
* Generation and treatment of waste
* Chemical use

For the energy field:
* Total energy consumption
* Primary energy sources
* Energy consumption in transport
* Electricity consumption
* Consumption of renewable energy sources

Users

Official statistics are intended for a wide range of users including governments (central and local), research institutions, professional statisticians, journalists and the media, businesses, educational institutions and the general public.
There are three types of users: those with a general interest, business interest or research interest. Each of these user groups has different needs for statistical information.

Users with a general interest

''Users with a general interest'' include the media, schools and the general public. They use official statistics in order to be informed on a particular topic, to observe trends within the society of a local area, country, region of the world.

Users with a business interest

''Users with a business interest'' include decision makers and users with a particular interest for which they want more detailed information. For them, official statistics are an important reference, providing information on the phenomena or circumstances their own work is focusing on. For instance, those users will take some official statistics into consideration before launching a product, or deciding on a specific policy or on a marketing strategy. As with the general interest users, this group does not usually have a good understanding of statistical methodologies, but they need more detailed information than the general users.

Users with a research interest

''Users with a research interest'' are universities, consultants and government agencies. They generally understand something about statistical methodology and want to dig deeper into the facts and the statistical observations; they have an analytical purpose in inventing or explaining interrelations of causes and effects of different phenomena. In this field, official statistics are also used to assess a government's policies.

One common point for all these users is their need to be able to trust the official information. They need to be confident that the results published are authoritative and unbiased. Producers of official statistics must maintain a reputation of professionalism and independence.

The statistical system must be free from interference that could influence decisions on the choice of sources, methods used for '
data collection
'', the selection of results to be released as official, and the timing and form of '
dissemination
''. Statistical business processes should be transparent and follow international standards of good practice.

Statistical programs are decided on an annual or multi-annual basis by governments in many countries. They also provide a way to judge the performance of the statistical system.

Producers at the national level

Official statistics are collected and produced by national statistical organisations (NSOs), or other organisations (e.g. central banks) that form part of the national statistical system in countries where statistical production is de-centralized. These organisations are responsible for producing and disseminating official statistical information, providing the highest quality data. Quality in the context of official statistics is a multi-faceted concept, consisting of components such as relevance, completeness, timeliness, accuracy, accessibility, clarity, cost-efficiency, transparency, comparability and coherence.

The core tasks of NSOs, for both centralized and decentralized systems, are determining user needs and filtering these fo
relevance
Then they transform the relevant user needs into measurable concepts to facilitate data collection and dissemination. The NSO is in charge of the coordination between statistical producers and of ensuring the coherence and compliance of the statistical system to agreed standards. The NSO has a coordination responsibility as its President/Director General represents the entire national system of official statistics, both at the national and at international levels.

Production process

The production process of official statistics comprises 8 phases, as documented in th
Generic Statistical Business Process Model (GSBPM)
* Specify Needs
* Design
* Build
* Collect
* Process
* Analyse
* Disseminate
* Evaluate

Data revision

Even after they have been published, some official statistics may be revised. Policy-makers may need preliminary statistics quickly for decision-making purposes, but eventually it is important to publish the best available information, so official statistics are often published in several 'vintages'.

In order to understand the accuracy of economic data and the possible impact of data errors on macroeconomic decision-making, the Federal Reserve Bank of Philadelphia has published a dataset that records both initial real-time data estimates, and subsequent data revisions, for a large number of macroeconomic series. A similar dataset for Europe has been developed by the Euro-Area Business Cycle Network.

Data Sources

There are two sources of data for statistics. Primary, or "statistical" sources are data that are collected primarily for creating official statistics, and include statistical surveys and censuses. Secondary, or "non-statistical" sources, are data that have been primarily collected for some other purpose (administrative data, private sector data etc.).

Statistical survey or sample survey

A statistical survey or a sample survey is an investigation about the characteristics of a phenomenon by means of collecting data from a sample of the population and estimating their characteristics through the systematic use of statistical methodology.
** The main advantages are the direct control over data collection and the possibility to ask for data according to statistical definitions.
** Disadvantages include the high cost of data collection and the quality issues relating t
non-response
and survey errors.

There are various survey methods that can be used such as direct interviewing, telephone, mail, online surveys.

Census

A census is a complete enumeration of a population or groups at a point in time with respect to well-defined characteristics (population, production). Data are collected for a specific reference period.
census should be taken at regular intervals
in order to have comparable information available, therefore, most statistical censuses are conducted every 5 or 10 years. Data are usually collected throug
questionnaires
mailed to respondents, via the Internet, or completed by a
enumerator
visiting respondents, or contacting them by telephone.
** An advantage is that censuses provide better data than surveys for small geographic areas or sub-groups of the population. Census data can also provide a basis for sampling frames used in subsequent surveys.
** The major disadvantage of censuses is usually the high cost associated with planning and conducting them, and processing the resulting data.

In 2005, th
United Nations Economic and Social Council
adopted a resolution urging: "Member States to carry out a population and housing census and to disseminate census results as an essential source of information for small area, national, regional and international planning and development; and to provide census results to national stakeholders as well as the United Nations and other appropriate intergovernmental organizations to assist in studies on population, environment, and socio-economic development issues and programs".

Register

A register is a database that is updated continuously for a specific purpose and from which statistics can be collected and produced. It contains information on a complete group of units.
** An advantage is the ''total coverage'' even if collecting and processing represent ''low cost''. It allows producing more detailed statistics than using surveys. Different registers can be combined and linked together on the basis of defined keys (personal identification codes, business identification codes, address codes etc.). Moreover, individual administrative registers are usually of high quality and very detailed.
** A disadvantage is the ''possible under-coverage'' that can be the case if the incentive or the cultural tradition of registering events and changes are weak, if the classification principles of the register are not clearly defined or if the classifications do not correspond to the needs of statistical production to be derived from them.

There are different types of registers:

→
Administrative registers
' or ''records'' can help the NSI in collecting data. Using the existing administrative data for statistical production may be approved by the public because it can be seen as a cost efficient method; individuals and enterprises are less harassed by a response burden
data security
is better as fewer people handle it and data have an electronic format.

→''Private registers'' such as registers operated by insurance companies and employer organizations can also be used in the production process of official statistics, providing there is an agreement or legislation on this.

→''Statistical registers'' are frequently based on combined data from different administrative registers or other data sources.

→For businesses, it is often legally indispensable to be registered in their country to a ''business register'' which is a system that makes business information collection easier.

→It is possible to find '' agricultural registers'' and ''registers of dwellings''.

Even though different types of data collection exist, the best estimates are based on a combination of different sources providing the strengths and reducing the weakness of each individual source.

Official Statistics presentation

Official statistics can be presented in different ways. Analytical texts and tables are the most traditional ways. Graphs and charts summarize data highlighting information content visually. They can be extremely effective in expressing key results, or illustrating a presentation. Sometimes a picture is worth a thousand words. Graphs and charts usually have a heading describing the topic.

There are different types of graphic but usually the data determine the type that is going to be used.
* To illustrate changes over time, a ''line graph'' would be recommended. This is usually used to display variables whose values represent a regular progression.

* For categorical data, it is better to use a ''bar graph'' either vertical or horizontal. They are often used to represent percentages and rates and also to compare countries, groups or illustrate changes over time. The same variable can be plotted against itself for two groups. An example of this is the age pyramid.
* ''Pie chart'' can be used to represent share of 100 per cent. Pie charts highlight the topic well only when there are few segments.
* '' Stacked bar charts'', whether vertical or horizontal, are used to compare compositions across categories. They can be used to compare percentage composition and are most effective for categories that add up to 100 per cent, which make a full stacked bar chart. Their use is usually restricted to a small number of categories.
* ''Tables'' are a complement to related texts and support the analysis. They help to minimize numbers in the description and also eliminate the need to discuss small variables that are not essential. Tables rank data by order or other hierarchies to make the numbers easily understandable. They usually show the figures from the highest to the lowest.
* Another type of visual presentation of statistical information is ''thematic map''. They can be used to illustrate differences or similarities between geographical areas, regions or countries. The most common statistical map that is used is called the choropleth map where different shades of a colour are used to highlight contrasts between regions; darker colour means a greater statistical value. This type of map is best used fo
ratio
data but for other data, proportional or graduated symbol maps, such as circles, are preferred. The size of the symbol increases in proportion to the value of the observed object.

Release

Official statistics are part of our everyday life. They are everywhere: in newspapers, on television and radio, in presentations and discussions. For most citizens, the media provide their only exposure to official statistics.
Television is the primary news source for citizens in industrialized countries, even if radio and newspapers still play an important role in the dissemination of statistical information. On the other hand, newspapers and specialized economic and social magazines can provide more detailed coverage of statistical releases as the information on a specific theme can be quite extensive. Official statistics provides us with important information on the situation and the development trends in our society.

Users can gather information making use of the services of the National Statistical Offices. They can easily find it on the agency's website.
The development of computing technologies and the Internet has enabled users - businesses, educational institutions and households among others- to have access to statistical information. The Internet has become an important tool for statistical producers to disseminate their data and information. People are able to access information online. The supply of information from statistical agencies has increased. Today the advanced agencies provide the information on their websites in an understandable way, often categorized for different groups of users.
Several glossaries have been set up by different organizations or statistical offices to provide more information and definitions in the field of statistics and consequently official statistics.

Quality criteria to be respected

The quality criteria of a national statistical office are the following: relevance, impartiality, dissemination, independence, transparency, confidentiality, international standards . There principles apply not only to the NSO but to all producers of official statistics. Therefore, not every figure reported by a public body should be considered as official statistics, but those produced and disseminated according to the principles. Adherence to these principles will enhance the credibility of the NSO and other official statistical producers and build public trust in the reliability of the information and results that are produced.

Relevance

Relevance is the first and most important principles to be respected for national statistical offices. When releasing information, data and official statistics should be relevant in order to fulfil the needs of users as well as both public and private sector decision makers. Production of official statistics is relevant if it corresponds to different user needs like public, governments, businesses, research community, educational institutions, NGOs and international organizations or if it satisfies basic information in each area and citizen's right to information.

Impartiality

Once the survey has been made, the NSO checks the quality of the results and then they have to be disseminated no matter what impact they can have on some users, whether good or bad. All should accept the results released by the NSO as authoritative. Users need to perceive the results as unbiased representation of relevant aspects of the society. Moreover, the impartiality principle implies the fact that NSOs have to use understandable terminology for statistics' dissemination, questionnaires and material published so that everyone can have access to their information.

Dissemination

In order to maximize dissemination, statistics should be presented in a way that facilitates proper interpretation and meaningful comparisons. To reach the general public and non-expert users when disseminating, NSOs have to add explanatory comments to explain the significance of the results released and make analytical comments when necessary. There is a need to identify clearly what the preliminary, final and revised results are, in order to avoid confusion for users. All results of official statistics have to be publicly accessible. There are no results that should be characterized as official and for the exclusive use of the government. Moreover, they should be disseminated simultaneously.

Independence

Users can be consulted by NSOs but the decisions should be made by statistical bodies. Information and activities of producers of official statistics should be independent of political control. Moreover, NSOs have to be free of any political interference that could influence their work and thus, the results. They should not make any political advice or policy-perspective comments on the results released at any time, even at press conferences or in interviews with the media.

Transparency

The need fo
transparency
is essential for NSOs to gain the trust of the public. They have to expose to the public the methods they use to produce official statistics, and be accountable for all the decisions they take and the results they publish. Also, statistical producers should warn users of certain interpretations and false conclusions even if they try to be as precise as possible. Furthermore, the quality of the accurate and timely results must be assessed prior to release. But if errors in the results occur before or after th
data revision
See Data Review/Data Checking in Glossary of Terms on Statistical Data Editing –
UNECE http://www.unece.org/stats/publications/editingglossary.pdf they should be directly corrected and information should be disseminated to the users at the earliest possible time. Producers of official statistics have to set analytical systems in order to change or improve their activities and methods.

Confidentiality

All data collected by the national statistical office must protect the privacy of individual respondents, whether persons or businesses. But on the contrary, government units such as institutions cannot invoke statistical confidentiality. All respondents have to be informed about the purpose and legal basis of the survey and especially about the confidentiality measures. The statistical office should not release any information that could identify an individual or group without prior consent. After data collection, replies should go back directly to the statistical producer, without involving any intermediary. Data processing implies that filled-in paper and electronic form with full names should be destroyed.

International standards

The use of international standards at the national level aims to improve international comparability for national users and facilitate decision-making, especially when controversial. Moreover, the overall structure, including concepts and definitions, should follow internationally accepted standards, guidelines or good practices. International recommendations and standards for statistical methods approved by many countries provide them with a common basis like the two standards of the International Monetary Fund, SDDS for Special Data Dissemination Standards and GDDS for General Data Dissemination System. Their aim is to guide countries in the dissemination of their economic and financial data to the public. Once approved, these standards have to be observed by all producers of official statistics and not only by the NSO.

See also

* ''Journal of Official Statistics''
* List of national and international statistical services

References

Further reading

* Giovanini, Enric
''Understanding Economic Statistics''
OECD Publishing, 2008,

External sources

International Association for Official Statistics

European Commission Eurostat

{{Authority control

Survey methodology
Political communication
Mathematical and quantitative methods (economics)