Measures of Underlying Inflation
Measures of underlying inflation (the so-called core inflation measures) -- obtained by removing transitory disturbances from the actual movements observed in the consumer prices -- are frequently used for inflation analysis. Instead of focusing on a specific core inflation measure, a comprehensive examination of various core inflation measures enables us to identify the trends of price movements in a more accurate manner.
The Bank of Japan's Research and Statistics Department releases the following four estimates in line with the monthly release of the official CPI for Japan: the diffusion index of increasing/decreasing items; the trimmed mean; the mode; and the weighted median.
These estimates are, in principle, released at 2:00 p.m., two business days after the release of the official CPI for Japan.
For more information on the estimation procedures and characteristics of these core inflation measures, please see the Bank of Japan Review Series below.
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