date and time when the respondent started to answer the questionnaire (only online respondents)

date and time when the respondent last accessed the questionnaire (only online respondents)

time in seconds it took the respondent to complete the whole questionnaire (only online respondents)

time in seconds the respondent spent on the survey introduction page (only online respondents)

date on which the survey institute received the print questionnaire back by postal mail (only print respondents)

respondent's sex (official cantonal register information)

respondent's year of birth (official cantonal register information)

respondent's marital status (official cantonal register information)

number of persons living in respondent's household (official cantonal register information)

number of underaged persons living in respondent's household (official cantonal register information)

dummy value indicating whether or not the respondent's own statement about his/her sex matches the official cantonal register information

difference in years between the respondent's own statement about his/her year of birth and the official cantonal register information

the weight assigned to the respondent as a result of the weighting by participation (using an iterative proportional fitting procedure)

the weight assigned to the respondent as a result of the weighting by voting_decision_federal_proposal_1, voting_decision_federal_proposal_2, voting_decision_federal_proposal_3, voting_decision_federal_proposal_4, voting_decision_federal_proposal_5, voting_decision_cantonal_proposal_1 and voting_decision_cantonal_proposal_2 (using an iterative proportional fitting procedure; only voters)

respondent's age at the end of the year of the ballot_date (derived from year_of_birth_official)

respondent's age group (derived from age)

respondent's marital status (official cantonal register information; reduced)

respondent's monthly gross equivalised income (OECD square root scale) based on average monthly gross household income