Instead, it assigns a weight to each component that is inversely related to its volatility. In other words, more volatile price series are given a lower weight. The core inflation measure that the Bank of Canada currently uses is called CPIX and is based on the exclusion method.
It removes eight of the most volatile components of the total CPI, as well as the effects of changes in indirect taxes such as the GST. The excluded items in CPIX are fruit, vegetables, gasoline, fuel oil, natural gas, mortgage-interest costs, intercity transportation, and tobacco products.