Volume indices of industrial production
2. Statistical presentation
Volume indices of industrial production characterize changes in the volume of industrial production during the reference period in comparison with the base period.
Statistical concepts and definitions
For purposes of the survey the unit is an activity unit (an enterprise or part of an enterprise that includes only one kind of economic activity).
The general population consists of economically active enterprises with at least one activity unit corresponding to industry (NACE Rev. 2 sections B, C or D).
Comparability - geographical
EU data on Eurostat website section: Industry.
4. Statistical processing
Data are collected from the CSB monthly statistical report form 1-r "Survey of industrial activity".
Data on volume indices of industrial production are obtained with the help of enterprise survey, building a threshold sample.
Industrial production output (volume) statistics is acquired by surveying economically active enterprises the main or secondary activity whereof covers industry (in line with the Sections B – Mining and Quarrying, C – Manufacturing, and D – Electricity, gas, steam and air conditioning supply, except for Group 35.3 – Steam and air conditioning supply, of the Statistical Classification of Economic Activities in the European Community (NACE Rev. 2)) and which a year before in industrial production employed 20 or more persons.
The sample additionally includes enterprises employing fewer than 20 people, to ensure that the data compiled on Divisions of NACE Rev. 2 (data at 2-digit level) cover at least 80 % of business structural statistics turnover in 2020.
The population of enterprises surveyed during the reference year may be revised by supplementing it with new economically active enterprises (in line with the mentioned criteria), specifying economic activities of the enterprises, upon receipt of revised information from respondents, as well as when the latest data are received from administrative sources.
In 2023, the number of enterprises surveyed monthly comprised 1 534. In 2021, their share in the total volume of industrial production exceeded 80 %.
Each month until the 25th date information on industrial production during the reference period at current prices is collected, according to the classes of Statistical Classification of Economic Activities (NACE Rev. 2).
The industrial output index data are collected from the CSB monthly statistical report form 1-r "Survey of industrial activity".Most of the data is submitted in the form of an e-report, other submission types (mail, e-mail, telephone) are less common.
Calculation of Industrial Production Index (henceforth – IPI) is based on the chain index method; within the framework of it the average monthly volume of production manufactured (at constant prices) previous year is used as a calculation basis and the value added of enterprises manufactured two years ago by NACE sections, chapters, groups and classes is used as weights. IPI is calculated by recalculating production output indicator at constant prices with the help of producer price indices. Weights are changed every year, thus changes in the structure of industry are taken into account.