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Going online with a face-to-face household panel: effects of a mixed mode design on item and unit non-response [journal article]
Source: Survey Research Methods, 9 (2015) 1. p.57-70
Mode system effects in an online panel study: comparing a probability-based online panel with two face-to-face reference surveys [journal article]
Source: Methods, data, analyses : a journal for quantitative methods and survey methodology (mda), 9 (2015) 1. p.3-56