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 & Pencil Interview (PAPI)
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