The Linking Factor has been computed as ratio of geometric means of the twelve-month indices of old and new series of WPI for the financial year 2024-25. At lower levels of disaggregation, the composition of the item basket has undergone significant changes across base years, owing to the inclusion of new items and the removal of obsolete ones. Consequently, the derivation of linking factors at such granular levels may not yield reliable results. Linking Factor for linking 2011-12 series with 2022-23 series is given below: -

While linking factors for All Commodities and Major Groups have been provided for reference, users are advised to exercise due caution while interpreting and comparing the indices across the two series. It may also be noted that, as a matter of policy, the Office of the Economic Adviser, DPIIT does not prescribe any specific methodology for linking or converting indices from one series to another. The selection of an appropriate linking approach is left to the discretion of users, depending on their analytical requirements and purposes