They may refer to both principal and secondary outputs of establishments. The monthly price deflators are compiled by the Singapore Department of Statistics.
Output value is used as weight at the commodity level, and value added the other levels.
The selection accounts for about 95 percent of total value added within each 2-digit industry. A basket of commodities is then selected from the main 5-digit industries based on output value. The items in the baskets account for about 90 percent of total output in each 5-digit industry. The selected enterprises contributed about 90 percent of output in manufacturing. Phone calls are made to clarify queries with companies.