Structure of Earnings Survey
Introductory note | Contents |
P r e f a c e
The Czech Statistical Office (CZSO) periodically presents publications containing structural statistics on earnings of employees. First sample survey took place for the reference year 1996. This publication rests on the results of Average Earnings Survey (ISPV) carried out by the Ministry of Labour and Social Affairs as a regular statistical survey from 1992. The Average Earnings Survey produces data on earnings of employees broken down by the type of management, by region, by industry (CZ-NACE), by the size of the reporting unit, by educational attainment, by salary scale, by sex and age, and by occupation according to CZ-ISCO-88.
The Average Earnings Survey differs in several aspects from other routine surveys in the field of labour and earnings statistics: data are collected on technical carriers - diskettes, and the scope of data is different. Collected are chosen data on individual employees, together with information on time worked, earnings accounted that are split into individual components. A tailor-made acquisition program reads data on individual earnings components straight from the computer systems of the reporting units.
The reporting units comprise incorporated businesses and budgetary, subsidized and membership organizations. This Survey covers all industries of the Czech national economy and all size groups of reporting units; although the sample is not representative for size group less than ten employees, and the average earnings data are substituted by *** symbol. The sample of ISPV is not based on random sampling.
For organizations without legal sovereignty in the education, there were not correct data observed for 2001; data were imputed by the estimation based on known information from different sources.
For the needs of CSO, the results of the Average Earnings Survey have been recalculated to correspond better with the nature of preceding publications. Some information on employees and whole units had to be left out for one reason or another. A file containing data on 511 288 employees has been compiled for the year 2001.
When comparing the results of this publication with those from preceding years, we should take account of some differences in methodology and particularly differences between the samples.
While analyzing earnings, we should take into consideration that this was a sample survey and no grossing related to the whole national economy has been made. This is why these results cannot be compared with those of a regular statistical survey on earnings. Net earnings were not asked directly, but they were calculated using gross earnings minus statutory health and social insurance and taxes.
Like in previous years and for better comparability of results, special samples were generated broken down by the number of paid hours representing earnings of employees working 1 592 paid hours or more in 2001. The purpose of these samples was to eliminate distortion due to the influence of employees who were ill for a long period of time or worked part-time. It is appropriate for a correct analysis to use data on this sample of employees. (In the previous years, the threshold for paid hours was 1 700, it was moved due to changes in the employees’ working hours – change from 8,5 to 8 hours a day – when meal break is not considered as a working time).
The objective of this publication is to look at earnings differentiation from various points of view. First of all it is focused on comparing average earnings between individual categories of employees, especially broken down like nowhere else, e.g. by occupation, by sex, by age and by educational attainment. Also available in this publication are the individual components of earnings and the comparison of differences in basic categories from this angle.
Note: Where only individual data available, asterisk can be found in the Tables
Prague, December 2002
Anna P o r u b s k á
Head of Employment and Wages Statistics Department