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India proposes annual revisions of industrial output weights in order to reflect economic changes

A government discussion document stated that India was considering revising the weights used in calculating its Index of Industrial Production to "better reflect" changes to the economy.

The proposal is part of a larger federal "push" to overhaul key economic data by updating methods and revising base-years in order to better reflect the current economic structure.

In May, the IIP will change its base year from 2011-12 to 2022-2023.

In India's 2011-12 IIP, manufacturing is about 78% of the base. Mining is 14%, and electricity is 8%. This reflects their respective shares in industrial activities.

The Statistics Ministry proposes to replace the current fixed-base methodology with a chained-based method that would update industry and sector weights every year.

The paper stated that 'the current system is less representative of industries as they grow, shrink, or emerge. It also said the mismatch could create substitution bias, which can distort estimates of growth.

India's IIP would be aligned with international best practices if it used a chain-linked indicator, as is done by the U.S.A., Britain, and other members of the European Union.

According to the proposal, the Ministry would review sector weights annually for mining, manufacturing?and electricity using the most recent national accounts data.

The?paper stated that it would update industry-level weighings using the Annual Survey of Industries.

The paper highlights the risks associated with this approach.

Chain-linked indexes are not additive, so the sub-indices can drift in periods of high volatility.

The paper stated that each monthly index will?undergo at least three revisions following the release of quick estimations before finalisation.

By January 25, the government is inviting comments and suggestions.

Last year, the government proposed a revision of the IIP compilation. It removed closed factories and replaced them with operational units in order to improve accuracy and conform with international standards.

(source: Reuters)