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 & Pencil Interview (PAPI)
Mailed questionnaire att intervals of 3 months

Correlate

Authors's Label

Extraversion

Our Classification

Operationalization

Eysenk (1964) Personality Inventory

Observed Relation with Happiness