Correlational finding on Happiness and subject: Long term happiness (< 10 years ago)

StudyMussen et al. (1980): study US 1930
TitleContinuity and Change in Womens Characteristics over Four Decades.
SourceInternational Journal of Behavioral Development, 1980, Vol. 3, 333 - 347
PublicMothers, followed from age 30 to 70, Berkeley, USA, 1930-70
Sample
Non-Response
Respondents N =81

Correlate
Author's labelCheerfulness
Page in Source 337
Our classificationLong term happiness (< 10 years ago)
Operationalization
Rating of cheerfulness (vs gloomy) on 7 point scales by 
independent interviewers.

T1 (1930): Ratings by two interviewers:
   - Clinical psychologist on the
     basis of an interview
   - Social worker on the basis of
     observations at home and during
     tests of the child at university.
   Inter-rater agreement: r=+.59
T2 (1970): Rating by one interviewer on    the basis of 
an extensive interview

Observed Relation with Happiness
Happiness
Measure
StatisticsElaboration/Remarks
A-CP-g-fi-n-7-ar=+.28 p < .05
Guidance group (N=53)
A-CP-g-fi-n-7-ar=+.27 ns
Control group (N=28)



A-CP-g-fi-n-7-aDMt=0
T1:  M=3.7  SD=1.1  Mt'=4.51
T2:  M=3.7  Sd=1.2  Mt'=4.51


Appendix 1: Happiness measures used
CodeFull Text
A-CP-g-fi-n-7-aSelfreport in focused interview:

Rating of cheerfulness by interviewer on the basis of an extensive interview.

Rating options:
7 cheerful
6
5
4
3
2
1 gloomy


Appendix 2: Statistics used
SymbolExplanation
DMtDIFFERENCE of MEANS AFTER TRANSFORMATION
Type: descriptive statistic only.
Measurement level: Correlate: dichotomous, Happiness: metric
Theoretical range: [-10; +10]

Meaning: the difference of the mean happiness (happiness measured at a 0-10 rating scale) between the two correlate levels.
rPRODUCT-MOMENT CORRELATION COEFFICIENT (Also "Pearson's correlation coefficient' or simply 'correlation coefficient')
Type: test statistic.
Measurement level: Correlate: metric, Happiness: metric
Range: [-1; +1]

Meaning:
r = 0 no correlation ,
r = 1 perfect correlation, where high correlate values correspond with high happiness values, and
r = -1 perfect correlation, where high correlate values correspond with low happiness values.
Source:
Ruut Veenhoven, World Database of Happiness, Collection of Correlational Findings, Erasmus University Rotterdam.
https://worlddatabaseofhappiness.eur.nl