Statistical processing

Source data

The primary source is a sample of approx. 1,000 industrial enterprises, which are stratified in terms of industry and size measured by number of employees (divided into four sizes). The framework population consists of kind of activities units (KAUs) in companies with at least 10 employees in the relevant industries. However, all kind of activities units (KAUs) with at least 200 employees in the selected industries are included in the sample, while companies with fewer than 20 employees are not selected for the sample. In general, kind of activities units (KAUs) with fewer employees are less likely to be drawn, however, there will be a high probability of being drawn if it is a small industry with large variation in turnover.

The drawing takes place at company level, which means that all kind of activities units (KAUs) that are part of a drawn company are included in the sample with the same enumeration factor. The last draw took place in 2022. Every year in the first quarter, the sample is supplemented with new companies with at least 200 employees. The Business Statistics Register, which is based on the Central Business Register (CVR), is used to update and update the sample of industrial companies.

For a small part of the sample, companies do not report, as data on turnover and inventories can be obtained directly from the VAT information on which the statistics Companies' purchases and sales are based.

The producer price index for goods is used in the calculation of the production index.

Information for oil and gas extraction, which is part of raw material extraction (section B) and energy supply (section D + E), was included in the calculation of the production index in 2005. The source of this data is primary material from the Danish Energy Agency and Danish Oil Contingency Stocks. The net price index and a special run on export figures from the Foreign Trade Statistics.

Frequency of data collection

Data are collected monthly.

Data collection

Data are collected partly by using an online questionnaire and partly by extracts from other statistics in Statistics Denmark.

Data validation

The questionnaire contains automatic display of previous reports. It is possible for companies to correct previous reports. When Statistics Denmark receives the report, data is debugged electronically, as limit values ​​have been set in the data system for how much current data is expected to deviate from previously reported data. If the limit values ​​have been exceeded, the data are examined in more detail, eg by manually comparing them with previous reports from the same company and with comparable companies. If further information is required, contact the company.

Data are also compared with information from the quarterly statistics Industry's sales of goods, which is a total count of industrial companies in Denmark with at least 10 employees. A number of the companies that report to the statistics are among the largest groups in Denmark. For these, Statistics Denmark has a special focus on the reports also across statistics.

Data compilation

The responses received are listed in the framework population, which includes all companies within the selected industries that have at least 10 employees. The enumeration thus assumes that the development in the smallest companies with between 10 and 20 employees is the same as the development in the companies in the next size group.

In the event of non-reporting, data is imputed using information from previous periods. If a company is a new reporter and there is a lack of reporting for the current period, imputation is not used and the company does not count in the sample for the month in question.

The level of dropout is monitored and the number of imputations decreases from the first publication of monthly data to the same data two months later, where monthly data is published as the final result.

Consistency in relation to the statistics Companies' Purchases and Sales is ensured by only selecting VAT data for companies with one kind of activities unit (KAU) on the CVR number used by the VAT register. In addition, only companies with a turnover of or less than DKK 100 million are selected. DKK in the statistics for the industry's sales of goods.

The statistics only include those of a company's workplaces where the industry is in industry. Most companies consist of one kind of activities unit (KAU), but especially large companies have activity in several industries, and the kind of activities units (KAUs) are therefore a subdivision of the company. This means that the turnover in these statistics is distributed differently between the industries than in the statistics where the unit is the company (the economic unit).

The turnover indices are formed by a simple indexation in relation to the average monthly turnover in the base year. In the calculation of aggregate turnover indices, the industry groups are weighed against their turnover. The production index is an implicit volume index that is calculated on the basis of turnover measured at fixed prices. It is found by taking revenue measured in current prices and correcting for the changes in inventories during the month. Inventories include two types of inventory: finished goods and work in progress. The sum of the stocks is converted to fixed prices using the monthly producer price index.

Production turnover is not calculated for main industry group 30.1 (shipyards and boatyards) as well as sections B, D and E. For shipyards and boatyards, the calculation of the base index is instead based on hours worked. For main sections B, D and E, the calculations of the index are based on information on production volumes, which is collected by the Danish Energy Agency (see further in the section on sources).

The production indices are formed by a simple indexation in relation to the average monthly production in the base year. In the calculation of aggregate production indices, the industry groups are weighed against their value added.

Adjustment

The figures are seasonally adjusted on the lowest level of publication. Indirect seasonal adjustment are used for calculating seasonal adjusted figures on a more aggregated level.