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The impact of unlisted and no-landline respondents on non-coverage bias. The Italian case

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  • Sala, Emanuela
  • Lillini, Roberto

Abstract

To survey the general population, survey agencies often use sampling frames of landline numbers. However, these frames may exclude a relevant share of the target population. In 2012, 50% of Italian adults are excluded from the sampling frame, as they are unlisted (UN) or do not own a landline telephone (NT). Using a unique national survey with full-coverage of the Italian population, our study describes the changes in the composition of landline telephone coverage over time and investigates differences in demographic and socio-economic characteristics between (i) respondents included in and excluded from the sampling frame and (ii) NT and UN respondents. It also explores whether these differences lead to under-coverage bias and evaluates the impact of current post-adjustment strategies on the total under-coverage bias as well as on its two components separately.

Suggested Citation

  • Sala, Emanuela & Lillini, Roberto, 2014. "The impact of unlisted and no-landline respondents on non-coverage bias. The Italian case," ISER Working Paper Series 2014-16, Institute for Social and Economic Research.
    • Handle: RePEc:ese:iserwp:2014-16
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    References listed on IDEAS

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    1. Andy Peytchev & Lisa R. Carley-Baxter & Michele C. Black, 2011. "Multiple Sources of Nonobservation Error in Telephone Surveys: Coverage and Nonresponse," Sociological Methods & Research, , vol. 40(1), pages 138-168, February.
    2. Fumagalli, Laura & Sala, Emanuela, 2011. "The total survey error paradigm and pre-election polls: the case of the 2006 Italian general elections," ISER Working Paper Series 2011-29, Institute for Social and Economic Research.
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