Seiler, Christian - ifo Leibniz-Institut für Wirtschaftsforschung an der … - 2014
survey mode. While a varietyof studies concerning mode effects in household or individual surveys exists, only lessis known … in case of business surveys. To give a contribution to this topic, we analyse alarge German business survey – the Ifo … Business Survey – which is answered by about7,000 respondents each month since 1949. In this paper, we focus on three …