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

  • Paula Vicente ISCTE
  • Elizabeth Reis
Keywords: telephone survey methodology, mobile phone surveys, mobile-phone only households, noncoverage rate

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.

Author Biography

Paula Vicente, ISCTE
Department of Quantitative Methods
Published
2009-06-27
How to Cite
Vicente, P., & Reis, E. (2009). The Mobile-only Population in Portugal and Its Impact in a Dual Frame Telephone Survey. Survey Research Methods, 3(2), 105-111. https://doi.org/10.18148/srm/2009.v3i2.1708
Section
Articles