The Business Integrated Databse (BID) is a joint Industry Canada and Statistics Canada project. The database only has four elements: the year, the SIC-E (four digit level), the Herfindahl Index at the SCG 4 digit level, and the Herfindahl Index at the SCG 6 digit level.
The Herfindahl Index (HI) is a plant product specialization index. A share of a particular SGC is calculated for each establishment by dividing the production of the SGC by the value of all goods manufactured by the establishment. HIs are the sum of the square of the shares