Data Source

Registry

Type of Study

Registries

Data gathering method

Registries

Conditions of access

Formal agreements (e.g. fees, research contracts, institutional agreements, etc.)

Researchers can gain access to the database through Statistics Denmark.

Time elapsed between application and reception of data

Permission to use the Danish Registers has to be requested from the Danish Data Protection Agency. This will extend the application process by 1-2 months.

Type of available data (e.g. anonymised microdata, aggregated tables, etc.)

Anomymised microdata.

Formats available

SAS

Language issues

The database and documentation are only available in Danish.

Years of collection, reference years, and sample sizes

Data collection ongoing since 1980. The sample covers the entire Danish population.

First year of collection

1980

Geographical coverage and breakdowns

Covers the entire population

Age range

Covers the entire age range

Statistical representativeness

Covers the entire population

Coverage of main and cross-cutting topics

The database includes approximately 100 variables. The IDA database covers the employment status, and workplaces and companies of the entire Danish population. People and companies are linked, and people can be characterised by information about their work place and vice versa.

Further Reading

A quality declaration is available in English at www.dst.dk/.../...abour-market-research--ida-.aspx

Standardisation

From 1996, Statistics Denmark has classified the economic characteristics for the population into socio-economic categories and within these, further by occupational codes according to the DISCO-88 norm, which is a Danish version of the International Standard Classification of Occupations (ISCO).

Possibility of linkage among databases

Data from the IDA database can be linked to other register data available at Statistics Denmark through an encrypted identification key.

Entry errors if applicable

N.A.

Breaks

In 2008, there is a break since the data collection method changed. There is another break in 1996 regarding job designation. This break is caused by the introduction of DISCO 88. See the documentation for more information: www.dst.dk/.../ida-databasen.aspx

Consistency of terminology or coding used during collection

DISCO 88

Strengths: This database covers the entire Danish population over time, which makes possible to analyse changes in labour market participation. Data further includes information about workplaces, which makes it possible to link information about colleagues and analyse the composition of the workplaces. Weaknesses: There are some breaks in data over time. See the documentation for more information: www.dst.dk/.../ida-databasen.aspx