All surveys that the respondents had accessed are saved in the database, regardless of whether the survey was fully or partially filled out, or left blank. If the respondent did not answer a specific question, a missing value will be displayed in the database next to the applicable variable.
According to the default settings, data review and analysis do not include empty or invalid units where NO question had been answered, e.g. a respondent only clicked on the survey link and left after the introduction. Invalid units (by status) can be included in the analysis with the help of advanced settings.