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Presentation at the Research Methodology Winter Camp AlMarefa University January 13, 2022 at 1.00pm. By Prof. Omar Hasan Kasule Sr. MB ChB (MUK). MPH (Harvard), DrPH (Harvard) Professor of Epidemiology and Bioethics, King Fahad Medical City
VARIABLES
OF THE CLASSROOM DATA:
- AGE (in
years),
- GENDER (male,
female)
- REGION of
birth (East, North, West, Central, West),
- ORDER in
family (first, second, third, higher), D
- DEGREE
expected (bachelor, masters, doctorate, postdoctorate),
- WEIGHT (in
kilograms),
- HEIGHT (in
centimeters),
- wearing
GLASSES (yes, no),
- COLOR preference
(blue, red, green, yellow).
VARIABLES
OF THE CLASSROOM DATA, Con’t.:
- number of
BROTHERS,
- number of
SISTERS,
- type of
primary SCHOOL (private, public),
- type of
UNIVERSITY (public, private), J
- JUMPING rank
(1st, 2nd, 3r etc.),
- RUNNING rank
(1st, 2nd, 3r etc.).
SPSS
VARIABLE VIEW OF CLASSROOM DATA:
SPSS
DATA VIEW OF CLASSROOM DATA:
DEFINITION
OF CORRELATION:
- Correlation
analysis is used as preliminary data analysis before applying more
sophisticated methods.
- Correlation
describes the relation between 2 random variables (bivariate relation like
height and weight) about the same person or object with no prior evidence
of inter-dependence.
- Correlation
indicates only association; the association is not necessarily causative.
- Correlation
measures linear relation and not variability.
FUNCTIONS
OF CORRELATION:
- Describing
the relation between x and y.
- Prediction of
y if x is known.
- Prediction of
x if y is known.
- Studying
trends.
- Studying the
effect of a third factor on the relation between x and y.
FIGURE
OF A SCATTERPLOT OF HEIGHT AND WEIGHT:
INTERPRETING
THE CORRELATION COEFFICIENT:
- 0.25 - 0.50
indicates a fair degree of association.
- 0.50 - 0.75
indicates moderate to fair relation.
- 0.75 indicate
good to excellent relation.
- r = 0
indicates either no correlation or that the two variables are related in a
non-linear way.
- Very high
correlation coefficients may be due to collinearity.
FIGURES
OF VARIOUS CORRELATION COEFFICIENTS:
FIGURES
OF VARIOUS CORRELATION COEFFICIENTS: Con’t.- 1
FIGURES
OF VARIOUS CORRELATION COEFFICIENTS: Con’t.- 2
FIGURES
OF VARIOUS CORRELATION COEFFICIENTS: Con’t.- 3
FIGURES
OF VARIOUS CORRELATION COEFFICIENTS: Con’t.- 4
FIGURES
OF VARIOUS CORRELATION COEFFICIENTS: Con’t.- 5
