Correlational finding on Happiness and subject: Past happiness ( 1 to 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 labelSatisfaction with lot
Page in Source 337
Our classificationPast happiness ( 1 to 10 years ago)
Operationalization
Rating of satisfaction with lot 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=+.60.
T2 (1970): Rating by one interviewer on    the basis of 
an extensive interview
Remarks
Guidance group only (N=53)

Observed Relation with Happiness
Happiness
Measure
StatisticsElaboration/Remarks
O-SLC-g-fi-v-7-br=+.15 ns
O-SLC-g-fi-v-7-bDMt=-.07
T1:  M=4.0  SD=1.2  Mt'=5.01
T2:  M=3.6  SD=1.3  Mt'=4.34


Appendix 1: Happiness measures used
CodeFull Text
O-SLC-g-fi-v-7-bSelfreport in focused interview

Two independent interviews. Each interviewer rated `satisfaction with lot' on the same scale.
1 tremendously satisfied
2
3
4 average
5
6
7 extremely dissatisfied


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