The Mobile-only Population in Portugal and Its Impact in a Dual Frame Telephone Survey

Authors :: Vicente, P.
Elizabeth Reis
Source :: Survey Research Methods, Vol 3, Iss 2, Pp 105-111 (2009), Scopus-Elsevier, Survey Research Methods, Repositório Científico de Acesso Aberto de Portugal, Repositório Científico de Acesso Aberto de Portugal (RCAAP), instacron:RCAAP
Publication Year :: 2009
Publisher :: European Survey Research Association, 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.<br />Survey Research Methods, Vol 3, No 2 (2009)

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