The face - to - face element is also cross-referenced with
the marked electoral register (that is, the copy of the register in polling stations where people's names are crossed off as they vote) so that they can verify after the election whether people genuinely did or did not vote.
In the BES face - to - face surveys we will be matching respondents to
the marked electoral register showing whether or not they actually voted on Election Day.
The second of those is a guess, but the first at least we can be pretty certain of, since the last British Election Study checked people who said they'd voted against
the marked electoral register, and those people who said they'd voted but hadn't did disproportionately claim they'd voted Labour.
Not exact matches
Ineligible: The respondent appeared on the
electoral register but was
marked ineligible to vote in the general election.
Not voted: The respondent appeared on the
electoral register and was eligible to vote but was not
marked as having voted.