إحصائيات رسمية
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.