Statistical indicator defines the content of an observed phenomenon. The structure of an indicator contains texts and attributes. Every indicator has a unique identification code attached to it. There are several texts belonging to indicators, such as “full name”, “definition” and “synonyms” which are used in questionnaires and output tables. Attributes specify whether an indicator refers to a period or a date, whether the data are numeric (a number) or character (letters), whether it is quantitative (e.g. “the number of...”) or qualitative (e.g. “married”), whether it is the result of a survey or an estimate, whether it is a countable or not, and whether it belongs to a group of surveys (e.g. property or insurance).
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