Study Veenhoven (2005): study ZZ 1990
- Public
- Adults, general public, 67 nations, 1990s
- Sample
- Respondents
- N = 100000
- Non Response
- Assessment
- Interview: face-to-face
Correlate
- Authors's Label
- Trend in happy life years 1948-1998
- Our Classification
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- Operationalization