Study Costa & McCrae (1980): study US 1965

Public:

25-75 aged white males (largely veterans), followed 10 years, USA, 1965-76

Sample:

Respondents:

N = 234

Non Response:

Assessment:

Questionnaire: paper
Mailed questionnaires at ten years interval

Correlate

Authors's label

Extraversion

Our Classification

Operationalization

Cattell (1973) Sixteen Personality Factor Questionnaire
Assessed at T1 (10 years ago)

Observed Relation with Happiness