Accuracy and reliability
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Purchase of commodities and services in the construction industry (Discontinued)
It is estimated that the statistic has a reasonable quality at an aggregated level. At material-group level it is estimated that the quality is low. No quantitative measures of the total uncertainty of the statistic have been done. For the totals in purchase of materials and services the sample uncertainty is approximately 5 pct.. The statistic has a number of measuring errors. These are estimated as being a greater source of uncertainty than the sample uncertainty. the statistic is reliable in the sense that published numbers are rarely revised.
Overall accuracy
No quantitative measures of total uncertainty have been estimated. For the total purchase of materials the sample uncertainty is approximately 5 pct. For the total purchase of materials the sample uncertainty is approximately 5 pct. The statistic has a number of sources of measuring error. These are assessed as being greater than the sample uncertainty and sets a limit on the quality of the numbers. There are no quantitative measures of the measuring error. The over coverage has not been estimated. The reply rate for the statistical year 2012 was 83 pct. The item-non response rate for the total purchase of services was under 0,5 pct. The item-non response rate for the total purchase of materials was under 4,1 pct.
Sampling error
Sample uncertainties for the scaled numbers have been calculated. For the total purchase of materials the sample uncertainty is approximately 5 pct. For the total purchase of materials the sample uncertainty is approximately 3.5 pct. For individual industries the sample uncertainty for the purchase of materials is under 30 pct and for the purchase of services, under 12 pct.
Non-sampling error
The statistic has a number of systematic errors. These are estimated as being a greater source of uncertainty than the sample uncertainty. The companies do not report their purchases in great enough detail and this sets a limit on the precision. There are no quantitative measures of this. The over-coverage-rate has not been estimated. The response rate was 83 pct. for the survey year 2012 at the time of publication. The item non-response rate is 0.4 for the total purchase of services and 4.1 for the total purchase of materials. Item non-response rate , total purchase of materials: 4,1 pct.
Quality management
Statistics Denmark follows the recommendations on the organisation and management of quality set out in the Code of Practice for European Statistics and the accompanying implementation model, the Quality Assurance Framework. Read more about these on the page Quality in official statistics.
Quality management is supported by common principles, guidelines and managerial responsibility for quality in statistical products and processes. The aim is to ensure a systematic and consistent approach to quality across the entire statistical production.
Quality assurance
Quality assurance at Statistics Denmark is integrated into the statistical production processes and is carried out in accordance with the principles of the Code of Practice for European Statistics. Read more on the page Quality in official statistics.
Quality assurance includes the continuous use of standardised procedures, documentation in line with international standards and internal controls related to data collection, data processing and dissemination. Experience gained from production is continuously used to identify needs for adjustments and improvements.
Quality assessment
It is estimated that the statistic has a reasonable quality at an aggregated level. At material-group level it is estimated that the quality is low. No quantitative measures of the total uncertainty of the statistic have been done. For the total purchase of materials the sample uncertainty is approximately 5 pct. For the total purchase of materials the sample uncertainty is approximately 3.5 pct. The statistic has a number of measuring errors. These are estimated as being a greater source of uncertainty than the sample uncertainty. The companies do not report their purchases in great enough detail and this sets a limit on the precision. There are no quantitative measures of this. The over-coverage-rate has not been estimated. The response rate was 83 pct. for the survey year 2012 at the time of publication. The item non-response rate is 0.4 for the total purchase of services and 4.1 for the total purchase of materials.
Item non-response rate , total purchase of materials: 4,1 pct.
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
The statistics include only final data.