Employees at a business are considered to have recently been in training if they started or successfully completed ITO training at the relevant ITO, within the previous five years while working at that business.
Businesses are identified using the business register in the IDI. A business is classified into a trade sector based on its industry ANZSIC code. Businesses listed as inactive are excluded. The region a business operates in is also determined from the business register. If a business operates in more than one region, its region is listed as "Multiple".
The number of employees at a business is determined by how many people were working there on the 31st of March of a given year, based on IRD records.