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Correlational findings

Study Loehlin & Nichols (1976): study US 1963

Public
Adolescent same-sex twins, USA, 1963
Sample
Respondents
N = 850
Non Response
29 %
Assessment
Questionnaire: Paper & Pencil Interview (PAPI)
Supplementary information from parents on mailed questionnaire

Correlate

Authors's Label
Happiness of twin sibling
Our Classification
Remarks
All twins are same sex
Distribution
N for happiness = A: 486 Aa:  204, Ab: 282, B: 320 Ba: 130, Bb: 190
N for % cheerful & satisfied = A: 509, Aa: 216, Ab: 293, B: 330, Ba: 135,  Bb: 195
Related specification variables
Operationalization
A Happiness of Identical twins
  a brothers
  b sisters
B Happiness of Fraternal twins
  a brothers
  b sisters

Observed Relation with Happiness

Happiness Measure Statistics Elaboration / Remarks O-HP-g-sq-v-7-a r = +.37 Happiness of identical twins (average r)
- brothers r = +.41
- sisters  r = +.34 O-HP-g-sq-v-7-a r = +.21 Happiness of fraternal twins (average r)
- brothers r = +.12
- sisters  r = +.27

Difference betwee correlations among identical & fraternal twins significant (p<05) O-HP-g-sq-v-2-b r = +.26 Happiness of identical twins (average r)
- brothers r = +.14
- sisters  r = +.35 O-HP-g-sq-v-2-b r = +.09 Happiness of Fraternal twins(average r)
- brothers r = +.17
- sisters  r = +.03)

Difference between correlations among identical & fraternal twins significant (p<.05) O-HP-g-sq-v-2-c r = +.16 Happiness of identical twins
- brothers r = +.07
- sisters  r = +.23 O-HP-g-sq-v-2-c r = +.07 Happiness of fraternal twins
- brothers r= +.11
- sisters  r= +.05

Difference between correlations among identical & fraternal twins ns

Significance tests computed by us, assuming that these samples are a probability sample of a wider population of twins.