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In order to maintain continuity in the time series data on Index of Industrial Production (IIP), it is imperative to provide a linking factor so that the new series, when released, may be compared with the outgoing one. As a matter of policy, the Central Statistics Office (CSO) does not prescribe or recommend to data users any particular method of linking, for conversion of index figures from one series to another. The choice of the method to link various index series is left to be decided by the users. The CSO has been using the arithmetic conversion method. According to this method, the linking factors for conversion of indices from the base 2004-05 series to the earlier base 1993-94 and from the base 1993-94 to the base 1901-81 up to Sectoral level are as follows:

Sector

Average IIP in 2004-05 (with base year 1993-94)

Linking Factor [from 2004-05 to 1993-94]

Average IIP in 1993-94 (with base year 1980-81)

Linking Factor

[from 1993-94 to 1980-81]

Mining

153.4

1.534

231.5

2.315

Manufacturing

222.5

2.225

223.5

2.235

Electricity

181.5

1.815

290.0

2.900

General Index

211.1

2.111

232.0

2.320

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Q: What is linking factor?
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