Study Costa & McCrae (1980): study US 1976

Public:

35-85 aged white males (largely veterans), USA, 1976

Sample:

Respondents:

N = 1100

Non Response:

T1:21%; T2:18%; T3:27%; T4:46%

Assessment:

Questionnaire: paper
Mailed questionnaire att intervals of 3 months

Correlate

Authors's label

Extraversion

Our Classification

Operationalization

Cattel (1973) Sixteen Personality
Factor Questionnaire

Observed Relation with Happiness