Introduction to DATIS a foundation stone for ISSP in Greece
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Introduction to DATIS a foundation stone for ISSP in Greece Ioannis Andreadis Aristotle University of Thessaloniki International DATIS Conference Aristotle University of Thessaloniki 24 August 2025
![A method similar to RDD for mobile
phone numbers
As far as the recruitment approach is concerned, it is very
easy to generate probability-based samples of mobile phone
numbers through random-digit-dial (RDD) procedures.
All mobile phone numbers in Greece start with 69 followed
by one of [0,3:5,7:9] and seven other digits.
Most of the countries in the world follow a similar pattern,
but there are some exceptions: e.g. in USA, mobile phone
numbers are region-based (the first 3 digits correspond to
the area code)
After RDD the numbers are validated through HLR lookups
Ioannis Andreadis @andreadis_i
9](https://image.slidesharecdn.com/andreadis-thessaloniki-250824092511-b2b8fede/85/Introduction-to-DATIS-a-foundation-stone-for-ISSP-in-Greece-9-320.jpg)
Introduction to DATIS a foundation stone for ISSP in Greece
- 1. Ioannis Andreadis Aristotle University of Thessaloniki International DATIS Conference Aristotle University of Thessaloniki 24 August 2025 Introduction to DATIS a foundation stone for ISSP in Greece
- 2. Outline DATIS and ISSP The importance of the Greek section of ISSP What we have accomplished Data Methods Impact Next steps Obstacles for ISSP in Greece 2
- 3. DATIS and ISSP Data for Inclusive Societies (DATIS) Exploring Enemies and Supporters of Inclusive Societies: Theoretical and Empirical Insights The International Social Survey Programme (ISSP) Since 1985. Today more than 9000 publications (excluding single country) We use the items from the ISSP questionnaires 3
- 4. The importance of the Greek section of ISSP The social data collected in this project is useful for the academic community, policy makers and the whole Greek society. Study citizens' perceptions on very important social issues covered by the ISSP surveys. Participation in ISSP offers international recognition and significant prestige to the School and to the entire university. Data are used at all levels (under/post graduate studies and PhDs) 4
- 5. What we have accomplished (data) 2025 Work Orientations 2024 Digital Societies 2023 National Identity & Citizenship* 2022 Family and Changing Gender Roles V* 2021 Health and Healthcare II** ELNES 2023* Elite Surveys Social Media Posts * Documentation, ** Before DATIS 5
- 6. What we have accomplished (methods) New Data Collection Methods Reactive (surveys with text messages) Nonreactive (Social media and Web Scrapping Data cleaning methods for pilot surveys (for detecting issues in questionnaires) and main survey data (for uncovering inattentive respondents) 6
- 8. Is it possible to conduct a national survey with SMS recruitment? How can we recruit a representative sample with text messages? What about people without Internet access? What are the best practices to conduct a general survey when we use text messages for recruitment? 8
- 9. A method similar to RDD for mobile phone numbers As far as the recruitment approach is concerned, it is very easy to generate probability-based samples of mobile phone numbers through random-digit-dial (RDD) procedures. All mobile phone numbers in Greece start with 69 followed by one of [0,3:5,7:9] and seven other digits. Most of the countries in the world follow a similar pattern, but there are some exceptions: e.g. in USA, mobile phone numbers are region-based (the first 3 digits correspond to the area code) After RDD the numbers are validated through HLR lookups Ioannis Andreadis @andreadis_i 9
- 10. Pre-notification, Invitation and Reminders The pre-notification informs the randomly selected mobile phone owners that they would soon receive an invitation to a survey organized by Aristotle University ofThessaloniki (AUTH) and a telephone number at AUTH they could call in case they had questions (builds trust with sample members) The invitation and reminders include a short text and a very short personalized link (epolls.eu/XXXX) that the sample members can directly tap on their device (if these are smartphones) or easily type it into a browser of another device to go to the mobile-friendly web survey Ioannis Andreadis @andreadis_i 10
- 12. Methods for pilot surveys Focusing on item non-response rates A spike in non-responses for a particular item is a flag for potential problems (e.g. participants’ confusion, privacy concerns, or technical glitches). Combining item non-response rates with participant feedback can provide insightful information 12
- 13. For main surveys The R package “Survey Data Quality” is being developed at: https://github.com/andreadis-ioannis/SurveyDataQuality In addition to the data quality functions, the R package contains a data file with responses to the ISSP 2020 questionnaire which is used as an example in the help files of the package 13
- 14. Description of the package A series of R functions that can be used to assess the quality of survey data Why do we need them? Even the most motivated respondents may get tired or lose their interest and motivation and they may respond less carefully to the questions of a self-administered survey (i.e., with minimal cognitive effort). Other respondents may not be interested in providing their best response. Instead, their motivation may be to complete the survey as quickly as possible (e.g., when they are after rewards/ incentives) 14
- 15. Based on the survey methodology literature Survey methodology scholars have used many methods to measure response quality. Based on the theory of satisficing we use a series of indicators of lower quality responses to estimate the level of engagement of survey participants in answering the questionnaires: Item-nonresponse Mid-point responses Straight-lining Speeding 15
- 16. What we have accomplished (impact) Participation in more than 10 international conferences and meetings all over the world with more than 20 presentations Greece is constantly running all pilot studies for the new ISSP questionnaires Recognizing the importance of the new methods of data collection and data cleaning, Greece was voted as a member of the Methodology Committee of ISSP 16
- 17. Next steps Presentations in this conference Comparative analyses as data from other countries become available from ISSP Dissemination to the public and policy makers (with the support of Greek media) Preparing the pilot study for ISSP 2026 (Role of Government) Securing funds for the next Greek ISSP studies 17
- 18. Obstacles for ISSP in Greece In most other countries, ISSP data collection is secured by national funds. In Greece, there are many obstacles. In most calls (e.g. Trust your Stars), social science proposals must compete with all other fields, and they get lower scores on the criterion of “practical implications” HFRI has a peculiar rule that does not allow Principal Investigators of successful proposal to participate in the next cycle 18
- 19. Thank you! Questions? Comments? Bluesky: @andreadis.bsky.social and @datisproject.bsky.social Linkedin: https://www.linkedin.com/in/iandreadis/ and https://www.linkedin.com/company/datis-project Datis Project: https://datis.gr/ Facebook/ Instagram: DATIS This project is carried out within the framework of the National Recovery and Resilience Plan Greece 2.0, funded by the European Union – NextGenerationEU (Implementation body: HFRI). 19