A Statistical Classification has a structure which is composed of one or several Levels. A Level often is associated with a Concept, which defines it. In a hierarchical classification the Classification Items of each Level but the highest are aggregated to the nearest higher Level. A linear classification has only one Level.
A Statistical Classification is a subtype of Node Set. The relationship between Statistical Classification and Level can also be extended to include the other Node Set types - Code List and Category Set.
|Level number||The number associated with the Level. Levels are numbered consecutively starting with level 1 at the highest (most aggregated) Level.||0..1||Textual|
|Level name||The name given to the Level.||0..1||Textual|
|Description||Text describing the content and particular purpose of the Level.||0..1||Textual|
|Number of items||The number of items (Categories) at the Level.||0..1||Textual|
|Code type||Indicates whether the item code at the Level is alphabetical, numerical or alphanumerical.||0..1||Textual|
|Code structure||Indicates how the code is constructed of numbers, letters and separators.||0..1||Textual|
|Dummy code||Rule for the construction of dummy codes from the codes of the next higher level (used when one or several categories are the same in two consecutive levels).||0..1||Textual|
|Items||An ordered list of the Categories (Classification Items) that constitute the Level.||1..n||Textual|