IBGE

Methodological Notes

1 - The quantum index considers primary data from the Monthly Survey of Industry - Physical Production (PIM – PF). The current group of products and respondents is a sample that accounts for 63% of the Gross Value Added of the Annual Industrial Survey of Companies in the 1998/2000 period. It encompasses 830 products and 3,700 local units, totaling approximately 4,900 monthly data, since January of 2002.

2 - The weighting base of the indicators is fixed and its reference is the average structure of the Gross Value Added relative to the 1998/2000 period.

3 - The calculus formula is adapted from the Laspeyres index – chain-based, with weights updating.

4 - Four types of indexes are published:

• MONTHLY FIXED-BASE INDEX (INDEX-NUMBER) That index compares the production of the reference month of the index with the monthly average produced in the reference year of the survey (2002);
• MONTHLY INDEX: That index compares the production of the reference month of the index with the same month of the previous year;
• ACCUMULATED INDEX IN THE YEAR: That index compares the production accumulated in the year, from January to the reference month of the index, with the same period of the previous year;
• ACCUMULATED INDEX IN THE LAST 12 MONTHS: That index compares the production accumulated in the reference last 12 months with the same immediately previous period;

The other INDEXES (for example, MONTH/PREVIOUS MONTH) can be obtained from the Monthly Fixed-Base Index.

5 - The seasonal adjustment of the series was obtained by the X-12 method, with the adjustment of trading days for moving holidays (Carnival and Easter). The series that have additive structure are the following: Overall Industry; Intermediate Goods; Consumer Goods; Semi-durable and Non-durable Consumer Goods; Manufacturing Industry; Mining and Quarrying Industry; Beverages; Apparel and Accessories; Wood; Pulp, Paper and Paper Products; Petroleum Refinement and Alcohol Production; Toiletries, Soaps and Cleaning Preparations; Other Chemical Products; Rubber and Plastic Products; Non-metallic Mineral Products; Machinery and Equipment; Office Machinery and Computer Equipment; Electronic Material and Communication Equipment and Apparatus; Motor Vehicles; and Furniture. Those that have multiplicative structure are: Capital Goods; Durable Consumer Goods; Food Products; Tobacco; Textiles; Footwear and Leather; Publishing, Printing and Reproduction of Recorded Media; Pharmaceutical Products; Basic Metals; Fabricated Metal Products; Electrical Machinery and Apparatus; Medical, Optical and Industrial Process Control Equipment, Watches and Clocks; Other Transportation Equipment; and Miscellaneous Manufacturing.

Since August of 2007, Publishing, Printing and Reproduction of Recorded Media; Office Machinery and Computer Equipment; Medical, Optical and Industrial Process Control Equipment, Watches and Clocks; and Miscellaneous Manufacturing have been seasonally adjusted. In that procedure, series with 68 data were considered, that is, from January of 2002 to August of 2007.

6 - The indexes presented herein are subject to the correction of primary data concerning the respondents of the survey. Revisions are incorporated to the reference year of the survey departing from January of the previous year.

Further information on methodological procedures can be obtained in the Coordination of Industry (COIN) – 500, Avenida Chile, 4th floor, Zip Code 20031-170 - Rio de Janeiro - RJ, telephone: (21) 2142-4513.