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Correlational findings

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

Correlate

Authors's label
Happiness at 14 and 20 months
Our Classification
Operationalization
T1: at 14 months
T2: at 20 months

Observed Relation with Happiness

Happiness Measure Statistics Elaboration / Remarks A-AB-mi-tsb-?-4-a 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
A-CA-mi-tsb-v-7-a 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