Vannieuwenhuyze, Jorre T. A.; Loosveldt, Geert - In: Sociological Methods & Research 42 (2013) 1, pp. 82-104
In order to investigate the advantage of mixed-mode (MM) surveys, selection effects between the modes should be evaluated. Selection effects refer to differences in respondent compositions on the target variables between the modes. However, estimation of selection effects is not an easy task...