1. Preparatory activities - CENSUS 2021
Dubravka Rogić-Hadžalić,
Damir Plesac,
Budapest, June 2017

2. Two key activities ADMIN project
Improving data collection methods - Census grant
CAPI
CAWI

3. Project ADMIN -improvement of the use of administrative sources
Applied for ADMIN project in:
2015/2016 (first ADMIN project)
2016/2017/2018 (second
ADMIN project)

4. Project ADMIN -improvement of the use of administrative sources
Croatian Bureau of Statistics (CBS) has applied for ADMIN project (Improvement of the use of Administrative sources) in order to:
examine the possibility of using existing data sources for the 2021 Census,
improve the quality of data,
reduce the number of questions in the Census Questionnaire and
create a certain preconditions for the establishing future population register.

5. Data sources for the 2021 and future Censuses
PIN system – metadata-base
Evidence of Ministry of internal affairs
Registrar's offices
Evidence on insured persons
Evidence on beneficiaries of pension insurance rights
Register of Persons with Disabilities
Croatian Institute for Health Insurance database
E-registra – Database of Ministry of Science, Education and Sport

6. Agreements
CBS has initiated and developed a cooperation agreement in the field of mutual exchange of information with:
Croatian Institute of Public Health
Croatian Institute for Pension Insurance
Croatian Institute for Health Insurance
Ministry of Administration
Agreements describe the general provisions about the cooperation, the method and the time of data delivery, use of data, dissemination and data quality.

7. PIN- personal identification number
Direct identifiers that were collected in the 2011 Census were
OIB ("PIN”- personal identification number) and
identity card number
As the number of identity cards is variable and it is not possible to verify its correctness by the algorithm, the use of data from administrative sources has been applied
In that process, data of Ministry of Interior were used, which provided quality control of persons enumerated more than once

8. "Four solid points"
As data from administrative sources are not sufficient for full control of persons enumerated more than once other data from the Census questionnaire were also used, namely, so called "Four solid points"
first name,
family name
date of birth and
place of birth.

9. Advantage and disadvantage of the Croatian statistical system
The major advantage of the Croatian statistical system is availability of unique identifier (PIN) that is generally used for administrative purposes. The same identifier has been also used in the last population census.
The identifiers of dwellings and households used in the previous census are intended solely for the purpose of establishing links between persons living in one particular housing unit with their dwelling and between persons and their households. But these statistical identifiers cannot be used in other statistical databases as there is no common general key.

10. Registers that are used in CBS
Statistical Business Register (SBR) is a database of legal units, enterprises, local units and enterprise groups that operate on the territory of Republic of Croatia.
Spatial Statistical Register is maintained centrally as an alphanumeric database, but also exist graphical database which is compatible with GIS software. The database contains all territorial units maintained by SGA including statistical districts and census districts. The contents are updated continuously.

11. Register of persons with disabilities
One of the best registers in Croatia for which the Act regulates the method of collecting data about the:
cause, type, degree and severity of health impairment,
the rights of persons with disabilities,
methods of processing and use of data, as well as the data protection.

12. Register of persons with disabilities and next Census
Because of all mentioned above, the CBS for the next Census:
seriously intends to consider the use of the Register of Persons with Disabilities to obtain data about the disabled persons and their characteristics,
omit the questions on disability from the Questionnaire in order to reduce their number, and thus shorten the time of data collection, reduce workload of the respondents and simplify the enumeration.

13. Basic variables and Databases
source 1
Source 2
source 3
source 4
source 5
source 6
source 7
PIN-system
MIA
Reg. Offic.
CIPI
CIPH
CIHI
JOPPD
PIN +
Date of birth
Country of birth
SeX
Permanent residence
Citizenship
Place of birth
Activity
Employed persons + 
Place of work (settlement/municipality)
Occupation
  +
Industry
+ -
Level of education
  + -

14. Coverage of the selected administrative sources
Date, as stated
Census
number
Evidence of Ministry of internal affairs
permanent res.
Evidence on insured persons
All insured persons in CIPI
Evidence on beneficiaries of pension insurance rights
all persons with beneficiaries of pension insurance rights in CIPI
Register of Persons with Disabilities
All registered persons with Disabilities
Croatian Institute for Health Insurance database
All insured persons in CIHI  
E-registra – Database of Ministry of Science, Education and Sport
All pupils in basic schools and students in secondary schools
2010/11
ISVU- system of the University Computing Centre
All students atending higher education

15. Census Grant CAPI and CAWI mixed mode census data collection
Testing the content of questionnaire and new technologies for data collection (CAWI and CAPI), on approximatively 20 enumeration areas (containing approximatively households)
Development and adjustment of all census forms for both CAPI and CAWI
Preparation of data validation and other processing rules
Developing and testing CAPI and CAWI software

16. Conclusion New methods of enumeration
Intention of using administrative registers
A new approach of data processing

17. Thank you very much