Table 8 Steps adopted to maximise comparability between the ESS and EVS data
Differences | Harmonisation | ||
|---|---|---|---|
Mode of data collection | Exclusion of the self-administered and telephone surveys conducted in Wave 5 of the EVS, limiting the comparisons to face-to-face, full length interviews. New variable created to specify survey mode (CAPI, PAPI) | ||
Study population | Included sample | EVS | ESS |
Exclusion of respondents aged 15, 16, and 17 from the ESS data, so that both samples include individuals 18 and over | Target population 18+ | Target population starting from 15 years old | |
Non-substantive responses | Harmonise missing data codes, differentiating among: | EVS | ESS |
- “Don’t know” - “No answer” - “Refusal” | −1 −5, −8, −9, −10 −2 | .c .d .b | |