India, Feb. 13 -- Calculating inflation involves four key processes: identifying the items for which price data is collected; classifying and weighing them, identifying the markets from which to collect data; and using all of the above to make an index which is statistically sound. The new series of the Consumer Price Index (CPI), which is the basis for calculating retail inflation from January 2026 onward, has made changes to all four processes. However, it is the changes in the first two processes that are the most important and the main reason for changing the series. According to the report of the Expert Group Report on Comprehensive Updation of Consumer Price Index and the press release issued by the National Statistics Office (NSO) on...