# Correlational findings

## Study Bachman et al. (1978): study US 1966

Public
Public highschool boys followed 8 years from grade 10, USA, 1966-74
Sample
Respondents
N = 1628
Non Response
2.8% at T1, 17.2% at T2, 21.0% at T3, 28.9% at T4, 28.5% at T5
Assessment
Multiple assesment methods
Interviews, tests and questionnaires

## Correlate

Authors's Label
Number of books in home
Our Classification
Operationalization
Simgle question at T1:
How many books are in your home?
1 = none, or very few (0 - 10);
2 = a few (11 - 25);
3 = one bookcase full (26 - 100);
4 = two bookcases full (101 - 250);
5 = three or four bookcases full (251 -     500);
6 = a room full; a library (501 or     more)

## Observed Relation with Happiness

Happiness Measure Statistics Elaboration / Remarks O-HP-g-mq-v-5-a = ns                      T1 books at home
T1 happiness:        tau = +.00  (ns)
T2 happiness:        tau = -.02  (ns)
T3 happiness:        tau = -.01  (ns)
T4 happiness:        tau = -.01  (ns)

T1:1966, T2:1968, T3:1969, T4:1970