The Industrial Production Index (IPI) measures the monthly evolution of the productive activity of the industrial branches, that is, of the extractive, manufacturing, production and distribution activities of electrical energy, water and gas, and for the first time for base 2010, division 36 as well: Water collection, filtering and distribution, from section E in CNAE-2009.
This indicator reflects the joint evolution of quantity and quality, eliminating the influence of prices.
In order obtain the IPI, a continuous survey is conducted, each month researching more than 11,500 establishments, for which information is obtained on representative products from all branches of activity.
The IPI methodology is fully harmonised with that of European Union countries.
New base 2010
The updating of the sample is one of the most important aspects in the base change process. To this end, a complete study is carried out of the industrial activities, products and informant units, for the purpose of improving its representativeness.
The IPI, base 2010, has included new activities, such as division 36: Water collection, filtering and distribution, has completed branches of activity that were already included, such as the research of the classes belonging to group 33.1: Repair of mechanical products, machinery and equipment. It has also included new products, such as prefabricated wooden buildings, electrical and/or hybrid motor vehicles, printing services and services related to the furniture industry.
The calendar effect
The IPI is presented as the original series, and as the series adjusted for calendar effects. This adjustment is carried out in order to eliminate the influence on the number of working days and the number of holidays in the different Autonomous Communities, and thus be able to carry out homogeneous comparisons between the months of different years. The seasonality of the series is also corrected with the new base 2010.
The complete weighting structure has been updated at all levels of functional and geographical breakdown, in order to represent industrial activity more precisely. This has used the 2010 Annual Industrial Companies Survey, which provides information regarding the added value of each branch of activity, to four digits of CNAE-2009, and the 2010 Annual Industrial Products Survey, which notifies of the production value of each product within each class of CNAE-2009.
The weightings of the Large Industrial Sectors of the IPI are as follows:
|Non-durable consumer goods