Swiss Electoral Studies (Selects) 2015, Befragung der Wählerinnen und Wähler nach den Wahlen - 2015

The 2015 study consists of three main complementary components: The Post-election survey, the Panel / Rolling Cross-Section survey, and the Candidate survey. The main difference compared to previous studies relates to the mode of data collection; the main emphasis was now moved towards web interviews. The other main innovation was the addition of a four-wave panel survey. As in 2011, novel thematic modules of particular salience to researchers were included in the different surveys, while keeping the necessary continuity in the core questionnaire of the Post-election survey for comparison with previous waves.

The post-election survey consists of 5,337 web and telephone interviews. The survey was done in a sequential mixed mode with web offered as the first option: 82% responded in this way, while 18% responded by telephone. The sampling was based on a representative sample of 2'600 Swiss citizens with an oversampling of small cantons to have at least 80 interviews per canton. An additional oversampling was done in the cantons of Zurich, Geneva, and Ticino.