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Correlational findings

Study Emde et al. (1992): study US Colorado 1986

Public:
14 months aged, same-sex twin pairs, Colorado, United States, 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 of Twin siblings
Our Classification
Operationalization
at 14 months, twin pairs were first observed at home and 2 weeks after that in the laboratory at the Institute for Behavioral Genetics in Boulder, behavior was videotaped and rated afterwards; parents completed questionnaire in the time between the home &  lab session;

Observed Relation with Happiness

Happiness Measure Statistics Elaboration / Remarks A-CA-mi-tsb-v-7-a r = +.19 p < .01 Monozygotic Twins A-CA-mi-tsb-v-7-a r = +.02 ns Dizygotic Twins A-CA-mi-tsb-v-7-a = Heritability component:       h²=+.34 (ns)
Shared environment component: c²=-.15 (ns)