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Title The Mobile-only Population in Portugal and Its Impact in a Dual Frame Telephone Survey
Source Survey Research Methods, 3, 2, pp. 105-111
Year 2009
Access date 01.07.2009
Abstract

In 2007 the percentage of mobile-only households in Portugal reached 36%; this is one of the highest levels in EU27 countries according to the EU E-Communications Households Survey. To assess the extent and nature of the potential bias in fixed phone surveys created by the absence of mobile-only households, a dual frame survey was conducted in which both fixed phones and mobile phones were used to collect data. There are significant differences between fixed phone respondents and mobile-only respondents in several demographic variables; however, we find that merging the fixed phone and the mobile-only sample produces general population estimates on substantive variables that are not significantly different from those obtained with the fixed phone sample alone.

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Year of publication2009
Bibliographic typeJournal article
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