# Correlational findings

## Study Schaefer & Bayley (1963): study US 1929

Public
Children followed from age 0 to 18, Berkeley, California, USA, 1929-47
Sample
Respondents
N = 54
Non Response
13% drop-outs (7 children and their mothers)
Assessment
Multiple assesment methods
Behavioral observation and interviews

## Correlate

Authors's Label
Speed of movements
Our Classification
Related specification variables
Operationalization
Expert rating on the basis of observa- tion of expressive behavior on a 7- point 'slow - rapid' scale.
12 ratings between month 10-36.

## Observed Relation with Happiness

Happiness Measure Statistics Elaboration / Remarks A-CP-mi-tsb-n-7-a = Happiness (hedonic level) was rated 12 times be- tween 10-36 months of age. Ratings combined: months 10 + 11 + 12 / 13 + 14 + 15 / 18 + 21 + 24 / 27 + 30 + 36.

Months   Months   Months   Months
10-12    13-15    18-24    27-36
A-CP-mi-tsb-n-7-a = -.07 Boys  10-12:-.18(ns) -.31(ns) -.26(ns) -.39(05)
13-15:-.05(ns) -.13(ns) -.07(ns) -.29(ns)
18-24:+.06(ns) -.06(ns) +.35(ns) -.02(ns)
27-36:+.10(ns) +.05(ns) +.13(ns) +.02(ns)
A-CP-mi-tsb-n-7-a = -.01 Girls 10-12:-.02(ns) +.10(ns) +.11(ns) -.07(ns)
13-15:-.05(ns) +.10(ns) +.28(ns) -.01(ns)
18-24:+.01(ns) -.04(ns) +.06(ns) -.27(ns)
27-36:+.02(ns) -.03(ns) -.04(ns) -.27(ns)
A-CP-mi-tsb-n-7-a = A-CP-mi-tsb-n-7-a =