Accuracy and reliability

Overall accuracy

The insecurity are considered low, as the respective sources has high quality. However, the combining of the sources makes insecurity , as the alignment between the sources cannot be perfect.

Sampling error

Not relevant for these statistics.

Non-sampling error

When compiling the statistics, a number of components are combined. This leads to uncertainty, as the elements can only be made approximately compatible. For households, payment on account with subsequent correction is the normal model. This may mean that the accrual for natural gas is not entirely correct.

Coverage error: Electricity prices for households are based on a product basket with approximately 30 products, which covers 70-75 percent of total consumption. The product basket is based on the sales structure two years earlier, which may mean that the reported average prices do not fully reflect the current consumer prices in the market. In addition, there may be uncertainty in the calculation of distribution costs, as the calculated averages do not necessarily correspond exactly to the actual deliveries to customers.

Measurement error: Payment on account is the normal model for households, which may mean that the accrual for natural gas prices is not entirely correct. This may create a shift in when actual price changes are reflected in the statistics.

Missing values: There are normally no missing values in the data collection, but in the event of missing reports from individual companies, data may be imputed.

Model assumptions: The statistics are based on several assumptions, including that companies with electricity consumption eligible for reimbursement actually request reimbursement, and that households with an annual electricity consumption of over 4,000 kWh often use heat pumps or other electric heating, which entitles them to a reduced tax.

Quality management

Statistics Denmark follows the recommendations on organisation and management of quality given in the Code of Practice for European Statistics (CoP) and the implementation guidelines given in the Quality Assurance Framework of the European Statistical System (QAF). A Working Group on Quality and a central quality assurance function have been established to continuously carry through control of products and processes.

Quality assurance

Statistics Denmark follows the principles in the Code of Practice for European Statistics (CoP) and uses the Quality Assurance Framework of the European Statistical System (QAF) for the implementation of the principles. This involves continuous decentralized and central control of products and processes based on documentation following international standards. The central quality assurance function reports to the Working Group on Quality. Reports include suggestions for improvement that are assessed, decided and subsequently implemented.

Quality assessment

It is continuously assessed whether all relevant components in the prices calculations are handled correct. Since the start of the statistics, only few errors has been detected and thus corrected.

Data revision - policy

Statistics Denmark revises published figures in accordance with the Revision Policy for Statistics Denmark. The common procedures and principles of the Revision Policy are for some statistics supplemented by a specific revision practice.

Data revision practice

Revisions occurs in the statistics when necessary. Revisions are to possible extend revisions compiled backwards.

Latest revisions have covered:

• the energy saving fee has been replaced from being part of level 1 prices to be part of level 2 (in line with energy taxes)
• the fixed administration fee for natural gas customers is now part of the prices (level 1). This has only significant importance for households.