Reference metadata describe statistical concepts and methodologies used for the collection and generation of data. They provide information on data quality and, since they are strongly content-oriented, assist users in interpreting the data. Reference metadata, unlike structural metadata, can be decoupled from the data.
Thivon Avenue, 196-198, Ag. Ioannis Rentis – Nikaia, 18233
1.6. Contact email address
Confidential because of GDPR
1.7. Contact phone number
Confidential because of GDPR
1.8. Contact fax number
Confidential because of GDPR
2.1. Metadata last certified
28 July 2025
2.2. Metadata last posted
28 July 2025
2.3. Metadata last update
28 July 2025
3.1. Data description
Data collection on student and researchers (and other categories) is based on Article 38 of Directive (EU) 2016/801 of the European Parliament and of the council of 11 May 2016 on the conditions of entry and residence of third-country nationals for the purposes of research, studies, training, voluntary service, pupil exchange schemes or educational projects and au pairing (recast).
The following datasets are collected under this framework:
Authorisations for study and research by reason, type of decision, citizenship and length of validity (migr_ressrath).
Authorisations for long-term mobility of researchers by reason, type of decision, citizenship and length of validity (migr_ressrltm).
Notifications for research and study by reason, decision, citizenship and length of validity (migr_ressrntf).
Directive (EU) 2016/801 was transposed at national level on 19 February 2020 under the law 4666.
3.2. Classification system
See table 3.2. in annex ‘Quality report tables on student and researchers’.
3.3. Coverage - sector
Migration and asylum – Residence permits statistics, student and researchers (and other categories).
3.4. Statistical concepts and definitions
See table 3.4. in annex ‘Quality report tables on student and researchers’.
3.5. Statistical unit
Number of persons.
3.6. Statistical population
See table 3.6. in annex ‘Quality report tables on student and researchers’.
3.7. Reference area
Greece.
3.8. Coverage - Time
See table 3.8. in annex ‘Quality report tables on student and researchers’.
3.9. Base period
Not applicable.
Number of authorisations to reside.
Calendar year.
6.1. Institutional Mandate - legal acts and other agreements
This metadata information is provided by the authorities of Greece to ensure compliance with the student and researchers (and other categories) statistics based on Article 38 of Directive (EU) 2016/801. As required, Member States must report to Eurostat on the data sources used, the reasons for the selection of these sources and the effects of the selected data on the quality of the statistics. Member States shall provide Eurostat with all the information necessary to evaluate the quality, comparability and completeness of the statistical information
6.2. Institutional Mandate - data sharing
Statistics concerning Article 38 of Directive (EU) 2016/801 is shared with relevant ministries, organizations, Eurostat, etc.
7.1. Confidentiality - policy
Regulation (EC) No 223/2009 on European statistics (recital 24 and Article 20(4)) of 11 March 2009 (OJ L 87, p. 164), stipulates the need to establish common principles and guidelines ensuring the confidentiality of data used for the production of European statistics and the access to those confidential data with due account for technical developments and the requirements of users in a democratic society.
7.2. Confidentiality - data treatment
The necessary measures are taken in all the process to guarantee the adequate data protection as established by current legislation.In the information processing phases, data that provide direct identification are only kept as long as they are strictly necessary to guarantee the quality of the processes.In the publication of the results tables, the details of the information are analysed to prevent confidential data from being deduced from the statistical units. In cases where microdata files are provided to users, they are anonymised.
8.1. Release calendar
No release calendar.
8.2. Release calendar access
No release calendar.
8.3. Release policy - user access
Not applicable.
Statistics on seasonal workers are currently published on Eurostat platform once a year within 6 months after the end of the reference year
10.1. Dissemination format - News release
Not applicable.
10.2. Dissemination format - Publications
Not applicable.
10.3. Dissemination format - online database
Eurostat dissemination yearly (on ESTAT website).
10.3.1. Data tables - consultations
Not applicable.
10.4. Dissemination format - microdata access
Not applicable.
10.5. Dissemination format - other
The metadata are complete and accessible online on the website of Eurostat.
10.5.1. Metadata - consultations
Not applicable.
10.6. Documentation on methodology
Member States have the responsibility of providing statistics to Eurostat in accordance with the Article 38 of Directive (EU) 2016/801 on the conditions of entry and residence of third-country nationals. Eurostat provides Technical Guidelines to the countries describing the procedures and the quality requirements for the statistics collected. All the statistics are compiled according to technical guidelines.
10.6.1. Metadata completeness - rate
Not applicable.
10.7. Quality management - documentation
Not available.
11.1. Quality assurance
Compilation of data is following the guidelines and instructions provided by Eurostat. Consistency validation checks are performed.
11.2. Quality management - assessment
Our data sets deal with constant assessments through internal checks.
12.1. Relevance - User Needs
The statistics collected are used in official publications and by a wide range of users at national, European and International level.These statistics are used by national administrations, academic researchers and civil society groups working on a wide range of topics including the integration of immigrants, the development and monitoring of national immigration procedures, and the projection of the future population and labour force. At European level, the main users of these statistics are Eurostat and DG Home. These statistics are used in several publications of the Commission, as well as in the preparation of regular reports, policy proposals and analysis. The statistics also provide an input to the European Migration Network (EMN) studies and reports that address specific issues of current policy importance.
12.2. Relevance - User Satisfaction
Not available.
12.3. Completeness
See table 12.3. in annex ‘Quality report tables on student and researchers’.
12.3.1. Data completeness - rate
Not applicable.
13.1. Accuracy - overall
The overall assessment of the accuracy of the data collection is considered to be high.
13.2. Sampling error
Not applicable.
13.2.1. Sampling error - indicators
Not applicable.
13.3. Non-sampling error
Not applicable
13.3.1. Coverage error
No coverage errors.
13.3.1.1. Over-coverage - rate
Not applicable.
13.3.1.2. Common units - proportion
Not applicable.
13.3.2. Measurement error
There are no measurement errors.
13.3.3. Non response error
Not applicable.
13.3.3.1. Unit non-response - rate
Not applicable.
13.3.3.2. Item non-response - rate
Not applicable.
13.3.4. Processing error
Not applicable.
13.3.5. Model assumption error
Not applicable.
14.1. Timeliness
Data supply to Eurostat is in accordance with the Regulation and the Technical Guidelines, also concerning the timeframe of sending data to Eurostat.The tables are produced and send to Eurostat within the mandatory deadlines: 180 days after the end of the reference period.
14.1.1. Time lag - first result
Not applicable.
14.1.2. Time lag - final result
Not applicable.
14.2. Punctuality
See table 14.2. in annex ‘Quality report tables on student and researchers’.
14.2.1. Punctuality - delivery and publication
Not applicable.
15.1. Comparability - geographical
The statistics are comparable between all regions of Greece, there is only one national system of accumulating and processing the data.
15.1.1. Asymmetry for mirror flow statistics - coefficient
Not applicable.
15.2. Comparability - over time
See table 15.2. in annex ‘Quality report tables on student and researchers’.
15.2.1. Length of comparable time series
Not applicable.
15.3. Coherence - cross domain
No incoherence noticed.
15.3.1. Coherence - sub annual and annual statistics
Not applicable
15.3.2. Coherence - National Accounts
Not applicable.
15.4. Coherence - internal
All the statistics produced are consistent since they are all obtained from the same administrative register and the calculation methodology is the same for all of them.
Not available.
17.1. Data revision - policy
The data undergoes continuous validation on a regular basis.
17.2. Data revision - practice
See table 17.2. in annex ‘Quality report tables on student and researchers’.
17.2.1. Data revision - average size
Not applicable.
18.1. Source data
See table 18.1. in annex ‘Quality report tables on student and researchers’.
18.2. Frequency of data collection
All source data are collected and processed continuously in the relevant database
18.3. Data collection
Data is extracted from the integrated information system
18.4. Data validation
The source data are checked and validated before compiling the aggregates output statistics sent to Eurostat.
18.5. Data compilation
All processes are according to guidelines. For each table the required records are extracted.
Data collection on student and researchers (and other categories) is based on Article 38 of Directive (EU) 2016/801 of the European Parliament and of the council of 11 May 2016 on the conditions of entry and residence of third-country nationals for the purposes of research, studies, training, voluntary service, pupil exchange schemes or educational projects and au pairing (recast).
The following datasets are collected under this framework:
Authorisations for study and research by reason, type of decision, citizenship and length of validity (migr_ressrath).
Authorisations for long-term mobility of researchers by reason, type of decision, citizenship and length of validity (migr_ressrltm).
Notifications for research and study by reason, decision, citizenship and length of validity (migr_ressrntf).
Directive (EU) 2016/801 was transposed at national level on 19 February 2020 under the law 4666.
28 July 2025
See table 3.4. in annex ‘Quality report tables on student and researchers’.
Number of persons.
See table 3.6. in annex ‘Quality report tables on student and researchers’.
Greece.
Calendar year.
The overall assessment of the accuracy of the data collection is considered to be high.
Number of authorisations to reside.
All processes are according to guidelines. For each table the required records are extracted.
See table 18.1. in annex ‘Quality report tables on student and researchers’.
Statistics on seasonal workers are currently published on Eurostat platform once a year within 6 months after the end of the reference year
Data supply to Eurostat is in accordance with the Regulation and the Technical Guidelines, also concerning the timeframe of sending data to Eurostat.The tables are produced and send to Eurostat within the mandatory deadlines: 180 days after the end of the reference period.
The statistics are comparable between all regions of Greece, there is only one national system of accumulating and processing the data.
See table 15.2. in annex ‘Quality report tables on student and researchers’.
