Production index measures the monthly change in gross output at constant prices of a representative sample of manufacturing enterprises.
Product classification follows a numeration scale.
Previous weights were derived from the Economic Census of 1978. Selected establishments are relatively large with 100 or more employees. Although a standard national or international nomenclature is not used for item specification, enumerators have detailed and precise product specifications, including specification of size and quality. Individual quantity indices are progressively aggregated using Laspeyres formula and corresponding weights in total industrial output. An adjustment to align the weights and base price periods is not made.