Statistical Terms Glossary

Clarity refers to the data's information environment: whether data are accompanied with appropriate metadata, illustrations such as graphs and maps, whether information on their quality also available (including limitation in use) and the extent to which additional assistance is provided by National Statistical Institutes.

Class is made up of students who follow a common course of study. Pupils/students are grouped together in a class based on the highest number of common courses, usually compulsory studies. A class is the pedagogical structure in which each student is registered. Regardless of the level of study, a student is registered in only one class. Students from different grades may be present in the same class, as occurs in one-teacher or two-teacher schools. Conversely, a school may have a number of classes for the same grade.

Uses imputation classes defined to create groups of records having a degree of similarity.

Related to network technology, is a 3 bit field within an Ethernet frame header when using 802.1Q tagging. The field specifies a priority value of between 0 and 7 inclusive that can be used by Quality of Service (QoS) disciplines to differentiate traffic. While CoS operates only on Ethernet at the data link layer, other QoS mechanisms (such as DiffServ) operate at the network layer and higher. Others operate on other physical layer.

Class size is the average number of students per class, calculated by dividing the number of students enrolled by the number of classes. In order to ensure comparability between countries, special needs programmes have been excluded.
Data include only regular programmes at these two levels of education and also exclude teaching in sub-groups outside the regular classroom setting.

Construction surveys and their resulting statistics generally make a distinction between the following classes of construction, new construction, on the one hand, and repairs and maintenance, on the other, the latter can be further broken down into capital and non-capital repairs and maintenance.

See plain vanilla swap.

Is a highly contagious disease that affects pigs and which normally results in the slaughtering of affected herds.

A set of discrete, exhaustive and mutually exclusive observations, which can be assigned to one or more variables to be measured in the collation and/or presentation of data.

The main purpose of a classification of activities is to classify economic entities and statistical units, such as
establishments or enterprises, according to the economic activity in which they mainly engage. The main aim is to provide a set of activity categories that can be utilised when dissecting statistics according to such activities. Different classifications are needed to cater for the different functions which statistics are required to perform, so at international and national levels classifications have been developed for a wide range of purposes, whereby each has its own specific area of application depending on the subject of classification. Economic classifications can be broadly divided into two categories:
Classifications of economic activities, which aim to cover all economic activities – from agriculture to services – are used to classify economic entities (enterprises, establishments, local units or other statistical units). Such classifications therefore form the basis for compiling statistics on output, the production factors entering into the production process (input: labour, raw materials and supplies, energy etc.), capital formation or financial transactions. The international classification for activity is the International Standard Industrial Classification of All Economic Activities (ISIC), maintained by the United Nations, used at world level. Classifications of products. The outputs of the economic entities are termed products and are generally divided into goods and services and grouped according to a product classification. The international classification for products is the Central Product Classification (CPC), maintained by the United Nations and used worldwide.

The International Standard Classification of Education is used to define the levels and fields of education.

The Classification of environment protection activities (CEPA) is the draft classification proposed within the framework of the United Nations methodology for integrated environmental and economic accounting

It is a classification used to identify the objectives of both individual consumption expenditure and actual individual consumption.

The classification of outlays of producers by purpose (COPP) is used to classify expenditures by producers (intermediate consumption, compensation of employees, etc.) by purpose (e.g. outlays on repair and maintenance or outlays on sales promotion).

The classification of the functions of government (COFOG) is a classification used to identify the socio-economic objectives of current transactions, capital outlays and acquisition of financial assets by general government and its sub-sectors.

The classification of the purposes of non-profit institutions (COPNI) is a classification used to identify the socio-economic objectives of current transactions, capital outlays and acquisition of financial assets by non-profit institutions serving households.

Visitors may be classified as either:

- international visitors, or
- domestic visitors

An enterprise which sets standards of design and construction of vessels and the maintenance of those standards throughout the life of the vessel by survey to secure, for the benefit of the community, high technical standards of design, manufacture, construction, maintenance, operation, and performance, for the purpose of enhancing the safety of life and property at sea.

Refers to how the categories of a classification are arranged, grouped and sub-divided. The categories of a classification can be arranged in either a hierarchical or flat structure. In flat classifications the categories are arranged at a single level. Hierarchical classifications have several levels corresponding to different degrees of resolution (detail) in the measurement (specification) of the variable being observed.

Is the basic unit to be classified in the classification (e.g. in an activity classification this would be the establishment or enterprise, in an occupational classification it will be the job).

Characteristics used for the classification of data for tabulation purposes.

Classroom teachers (International Standard Classification for Education (ISCED) 0-4) includes professional personnel education teachers; and other teachers who work with students as a whole class in a classroom, in small groups in a resource room, or one-on-one inside or outside a regular classroom. It includes chairpersons of departments whose duties include some amount of student instruction. The category does not include student teachers, teachers’ aides, or paraprofessionals

bisque clause; cross-default clause

Soil with very small, flat particles that tend to pack together tightly.

Refers to a money market operation without under lying documentary security. (Note that in the U.K clean means exclusive of accrued interest.)

Financial advances made without documentary support.