Correlational finding on Happiness and subject: School-success

StudyOECD (2017): study IS 2015
TitlePISA 2015 Results. Students' Well-Being. Volume III.
SourceOECD Publishing, 2017, Paris, France
URLhttp://www.oecd-ilibrary.org/education/pisa-2015-results-volume-iii_9789264273856-en
Public15-16 aged, secundary school students, Iceland, 2017
SampleProbability multi-stage random
Non-Response
Respondents N =3374

Correlate
Author's labelSchool performance in mathematics
Page in Source Table III.3.3b, Annex B3, p.514
Our classificationSchool-success
Operationalization
Mathematical performance, for PISA, measures the 
mathematical literacy of a 15 year-old to formulate, 
employ and interpret mathematics in a variety of 
contexts to describe, predict and explain phenomena, 
recognising the role that mathematics plays in the 
world. The mean score is the measure. A mathematically 
literate student recognises the role that mathematics 
plays in the world in order to make well-founded 
judgments and decisions needed by constructive, engaged 
and reflective citizens.
Observed distributionDeciles and quartiles

Observed Relation with Happiness
Happiness
Measure
StatisticsElaboration/Remarks
C-BW-c-sq-l-11-eDM=+ p < .05
Score decile        Mean Happiness
1                      7,29
2                      7,40
3                      7,62
4                      7,76
5                      7,76
6                      7,82
7                      7,93
8                      8,02
9                      8,12
10                     8,21

difference 10-1:      +0,92
C-BW-c-sq-l-11-eDM=+ p < .05
Score quarter       Mean Happiness
Bottom                  7,39
Second                  7,74
Third                   7,90
Top                     8,14

difference Top-Bottom: +0,75


Appendix 1: Happiness measures used
CodeFull Text
C-BW-c-sq-l-11-eSelfreport on single question:

Here is a picture of a ladder. The top of the ladder '10' represents the best possible life for you and the bottom '0' is the worst possible life for you. In general , where on the ladder do you feel you stand at the moment? Tick the box next to the number that best describes where you stand
10 best possible
9
8
7
6
5
4
3
2
1
0 worst possible life


Appendix 2: Statistics used
SymbolExplanation
DMDIFFERENCE of MEANS
Type: descriptive statistic only.
Measurement level: Correlate: dichotomous, Happiness: metric
Range: depending on the happiness rating scale of the author; range symmetric about zero.

Meaning: the difference of the mean happiness, as measured on the author's rating scale, between the two correlate levels.
Source:
Ruut Veenhoven, World Database of Happiness, Collection of Correlational Findings, Erasmus University Rotterdam.
https://worlddatabaseofhappiness.eur.nl