Statistical processing

Source data

The producer price index for refurbishment and maintenance are calculated on the basis of prices reported by selected companies. The sample is selected using a top-down approach.

Frequency of data collection

Yearly.

Data collection

For the producer price index for refurbishment and maintenance the prices are collected through an electronic reporting form, which is sent to relevant contacts within the selected companies.

Data validation

The first validation of the reported prices takes place when data arrive to Statistics Denmark. Here they are auto tested for unusual developments. If the change in prices is greater than a predetermined threshold value, then these prices will be checked manually by the staff and will only be accepted if the reporting company can verify the change. When all prices are in the system, a validation report will be generated. This report includes information on all price changes and measures the effect of these on the elementary aggregates. The final validation is a qualitative inspection of the calculated index tables.

Data compilation

The producer price index for refurbishment and maintenance are calculated in a hierarchical system, where the collected prices are divided into groups identified by kind of activity. These groups are then aggregated into so-called elementary aggregates for which basic prices can be calculated. Elementary indices are calculated on the basis of basic prices between two or more periods. The developments of the basic prices are therefore equal to the total price change for a given group of activity. Following this the elementary indices are weighted together as aggregated price indices. Each elementary index is given a weight used to weigh the indices together. The weights are based in information from the Danish Technological Institute.

Adjustment

No corrections are made beyond what has already been described.