Monthly Survey in Retail Trade, Hotels and Restaurants
Introductory note | Contents |
This new publication called „Monthly Survey in Retail Trade, Hotels and Restaurants“ purvey basic information on retail trade in the Czech Republic can also be found in monthly News Releases presented on the Czech Statistical Office’s web sites always on the 33rd working day after the reference month.
Data in this publication have been collected using the monthly statistical questionnaire SP 1-12. Sales indices are measured, and the results include units with principal activity retail trade, hotels and restaurants. Reporting units with 100 or more employees are covered all, and smaller enterprises by way of samples, whose size depends on the share of the total number of units in a given size group to those in the 3-digit Group of CZ-NACE. Groups of enterprises with low numbers of employees that, according to the Business Register, are not numerous, are covered all by the survey. In groups where random sampling is applied, so-called rotation takes places, i.e. partial substitution of the sample, aimed at updating the set of reporting units on the one hand, and keeping comparability with data produced previously on the other. As a result, randomly chosen enterprises principally remain in the sample for four consecutive years and then they are substituted.
The questionnaire SP 1-12 measures sales, both including VAT and not including VAT; sales including VAT are used to calculate the sales index. It is supposed for this monthly survey that the number of units is constant throughout the year: therefore, the results of the monthly survey may differ from the results produced by quarterly or annual surveys whose purpose is to estimate not only the index, but the absolute volume of sales, and that is why they take into account also the changing number of enterprises in individual periods. Different samples in some of the Divisions of CZ-NACE with large variance in sales are another cause of possible discrepancies.
In compliance with the re-basing of price indices (2000 average becoming the base) used by the CZSO as from January 2001, the calculation of the sales index was changed accordingly. Aggregate indices now use the weights of 2000. Sales measured by the monthly survey at the level of 3 or 4 digits of CZ-NACE in individual months of 2000 serve as the weights.
Y-o-y sales indices at current prices are derived from the monthly survey for each deepest CZ-NACE level. There has been no change in this point of the calculation. For the same CZ-NACE levels, the price statistics produces also y-o-y price deflators for individual months and price deflators of individual months related to the 2000 average.
Using the chaining of deflators, monthly sales at current prices for the deepest CZ-NACE levels are converted to the 2000 price level. The sum of sales at constant prices gives aggregate sales at constant prices, which provide a basis for the calculation of y-o-y indices at constant prices. Aggregate deflator related to the 2000 average is a ratio of aggregate sales at current and constant prices. Y-o-y deflators are the ratio of y-o-y sales indices at current and constant prices. The sum of 2000 monthly sales aggregated by CZ-NACE at current prices amounts to the sum of sales at constant prices.
The time series of indices re-based to 2000, covering 1997-2000, were made available in the publication “Results of Monthly Survey on Services” for June 2001 (code of publication 9002-01, released on 31 August 2001).
Data for last three published months of current year are retroactively updated on a regular basis, using questionnaires received after deadline. Final data for 2004 will be published in half 2005, data for 2003 are already final.