Seasonally adjusted index of sale of construction and assembly production in constant prices. The term seasonality refers to regular deviations from the overall annual trend. Seasonal correlation takes into account calendar variability, the order of business days, fixed and movable holidays as well as the so-called Easter effect.

The TRAMO/SEATS procedure based on ARIMA modelling recommended by Eurostat is used adjust for seasonality. The basis for seasonal adjustment are series. The need to ensure stability of published results requires that various forecast indicators for quarterly (semi-annual) periods be used at this stage. Following such periods, corrections to published data are made.

• Regulation (EU) 2019/2152 of the European Parliament and of the Council of 27 November 2019 on European business statistics, repealing 10 legal acts in the field of business statistics
  Place of publication: (Dz. Urz. UE L 327 z 17.12.2019, str. 1, z późn. zm.)

• Seasonally unadjusted index of sale of construction and assembly production in constant prices
• Sale of construction and assembly production