Correlational finding on Happiness and subject: School performance

StudyOECD (2017): study TR 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, Turkey, 2017
SampleProbability multi-stage random
Non-Response
Respondents N =5895

Correlate
Author's labelSchool performance in science
Page in Source TableIII.3.3a/3.5, p.279,280,281
Our classificationSchool performance
Operationalization
Scientific performance, for PISA, measures the 
scientific literacy of a 15 year-old in the use of 
scientific knowledge to identify questions, acquire new 
knowledge, explain scientific phenomena, and draw 
evidence-based conclusions about science-related 
issues. The mean score is the measure.
Observed distributionDeciles and quartiles

Observed Relation with Happiness
Happiness
Measure
StatisticsElaboration/Remarks
C-BW-c-sq-l-11-eDM=- ns
Score decile   Mean Happiness
1                6,34
2                6,29
3                6,16
4                6,10      
5                5,99
6                5,94
7                6,07
8                6,09
9                6,03
10               6,19

Difference 10-1
- all           -0,16 
- boys          -0,16
- girls         -0,10
C-BW-c-sq-l-11-eDM=- ns
Score quarter   Mean Happiness
Bottom          6,28
Second          6,07
Third           6,03
Top             6,10

difference Top-Botom: -0,18


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