The 2015b Hellenic (Greek) National Election Voter Study has been conducted by the Research Team of Web-based surveys - School of Political Science, Aristotle University of Thessaloniki as part of the research project Web-based election studies of ELNES.
The survey was conducted as a mixed-mode survey in the period between October 29, 2015 and February 29, 2016 and was based on the CSES module 5 pilot questionnaire. The recruitment of the respondents was done using Random Digit Dialing (RDD). The selected respondents were called on the phone and they were asked to provide their email address if they wanted to participate in a web survey conducted by the Research Team of Web-based surveys - Department of Political Science, Aristotle University of Thessaloniki. These email addresses have been used into the epolls.gr web survey system. Respondents who lacked Internet access and/or an email account were then asked to answer the questionnaire via a telephone interview. In addition, there was an amount of email addresses and telephone numbers of people who had participated in ELNES 2015a and they had agreed to participate in future ELNES studies. The final dataset consists of 868 respondents to the web survey and 210 to the telephone interview.
You can download the Hellenic (Greek) National Study 2015b from ICPSR.