Please use this identifier to cite or link to this item: http://hdl.handle.net/10419/123802
Authors: 
Sala, Emanuela
Lillini, Roberto
Year of Publication: 
2014
Series/Report no.: 
ISER Working Paper Series 2014-16
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.
Subjects: 
Telephone surveys
coverage error
bias in telephone surveys
JEL: 
C81
C83
D72
Document Type: 
Working Paper

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