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 Neo-Latin statisticum collegium (council of state) and refers to science of the state. According to the Organisation for Economic Co-operation and Development (OECD), 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:
Almost every country in the world has one or more government agencies (usually national institutes) that supply decision-makers and other users including the general public and the research community with a continuing flow of information (...). This bulk of data is usually called official statistics. Official statistics should be objective and easily accessible and produced on a continuing basis so that measurement of change is possible.
Official statistics result from the collection and processing of data into statistical information by a government institution or international organization. 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.
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.
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.
Further information: Demographics
Statistical indicators provide an overview of the social, demographic and economic structure of the society. Moreover, these indicators facilitate comparisons between countries and regions.
For population, the main indicators concern demographics, such as:
The gender statistics include:
In the employment category:
There are various indicators for the economy such as:
For trade indicators we find:
Environment indicators include:
For the energy field:
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 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 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 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.
Official statistics are collected and produced by national statistical organizations (NSOs), or other organizations (e.g. central banks) that form part of the national statistical system in countries where statistical production is de-centralized. These organizations 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 for 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.
The production process of official statistics comprises 8 phases, as documented in the Generic Statistical Business Process Model (GSBPM):
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 vignettes.
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.
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.).
Main article: Survey methodology
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 to non-response and survey errors. There are various survey methods that can be used such as direct interviewing, telephone, mail, online surveys.
Main article: 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. A 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 through questionnaires mailed to respondents, via the Internet, or completed by an 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, the 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".
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:
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.
Further information: Data and information visualization
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.
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.
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 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, non-governmental organizations (NGOs) and international organizations or if it satisfies basic information in each area and citizen's right to information.
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.
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.
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.
The need for 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 the data revision, 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.
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.
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 Standard (SDDS) and General Data Dissemination System (GDDS). 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.