In October 2010 in NSI a seasonal adjustment of business surveys’ time series was carried out for the first time. The procedure was carried out with the help of the software developed by Eurostat Demetra, where the algorithm TRAMO / SEATS was applied.

In the majority of the statistical series no pronounced seasonal effects were registered, which can change the tendency in the evolution of the original non-seasonally adjusted time series of the economic sectors. Because of that reason the NSI continues the present practice to publish non-seasonally adjusted data of business surveys.