Correlational findings | World Database of Happiness

Study Plomin et al. (1993): study US Colorado 1986

Public: Same-sex twins, Colorado, United States, followed from 14 to 20 months, 1986-1989
Sample
Respondents: N = 398
Non Response
Assessment: Behavioural observation
At 14 months: observation at home, 2 weeks later observation in laboratory

Authors's Label

Happiness at 14 and 20 months

Our Classification

Operationalization

T1: at 14 months
T2: at 20 months

Happiness Measure

Statistics

Elaboration / Remarks

DM = +

               boys      girls
T1: 14 months  M=0.89    M=1.01
T2: 20 months  M=1.05    M=1.09
- difference:   +0.16     +0.08

DM = +

               boys      girls
T1: 14 months  M=4.6     M=4.9
T2: 20 months  M=4.9     M=5.0
- difference:   +0.3      +0.1