This document defines key concepts in research methods including concepts, constructs, variables, and different types of variables. It explains that concepts are categories or generalizations formed from specific instances that share common characteristics. Constructs are complex concepts that cannot be directly observed but are defined by indicators. Variables can assume different values and can be attribute, active, continuous, discrete, dichotomous, or multiple category. The document also discusses dependent and independent variables, exogenous and endogenous variables, moderator variables, and extraneous variables like confounding and environmental variables.

1. SECTION 5
Concepts, Construct & Variables
GRACE C. MERINILLO
(Masters of Arts in Language Education)

2. CONCEPTS
- are categories or generalization from
particular instances
- names given to things that share
common characteristics
-these are intellectual abstractions and
creations of the human intellect

3. Example: Try this exercise: What concepts are
suggested by the following instances?
I. (a)honey (d) syrup
(b) brandy (e) milk
(c) water (f) oil
II. (a)sunny
(b) strong wind skies
(c) cloudyskies
(d) rain

4. CONSTRUCT
- is a concept that has been deliberately
and consciously invented or adopted for
a specific purpose (Kerlinger, 1973)
- is impossible to observe directly and is
in higher-order concepts, which are
considered complex

5. CONCEPTS CONSTRUCTS
Income & Educational
Attainment
Socio-economic Status
Love between parents,
Love between siblings,
Love between friends,
Love of God
Love

6. OPERATIONALIZING CONSTRUCTS
AND VARIABLES

7. Being variably defined, constructs
serve as major points for
understanding a research problem.
However , many students of research
find it difficult to conceptualize their
studies because of lack of basic
understanding about how constructs
behave with respect to a problem.

8. The process of “pinning down” the
construct has to begin by realizing
that whatever the researcher would
like to measure the indicants of
some property of the objects or
entities.

9. Van Dalen (1979) concretizes it with
the following example:
“A student cannot be measured , but
indicants of his weight, intellectual
capacity, achievement in
Mathematics, punctuality, and other
properties can be”

10. Property
- A concept or logical construct that
describes particular characteristics
which is common to all members of
a set, but on which members of a
set vary.
Example: Punctuality

11. Indicants
- Something that points to the property
and helps define it.
Example:
(a) Is never late for class
(b) Hands in term of paper on or before
the due date
(c) is among the first people to arrive for
meeting

12. Determining the constructs as a property
in terms of indicants is called
“operationalizing of a construct or
concept”. This process is necessary so
that the researcher would be able to
progress on his research plans from the
realm of theory to the realm of practical
investigation. In this way, constructs are
rendered more measurable and become
referred to as “variable”

13. VARIABLES
- are concepts that assume more than
one value
- are qualities, properties or
characteristics of persons, things , or
situations that change or vary (Burns
and Grove, 1995)

14. Two kinds of a Variable
( Kerlinger, 1993)
1. Measured Operational Definition
2. Experimental Operational Definition

15. Measured Operational Definition
- describes how a variable will be
measured
Experimental Operational Definition
- spells out the details (operations) that
the researcher’s manipulations of the
variable

16. Example: (MOD)
Variable Definition
1. Achievement 1. (a) Standardized
achievement test score
(b) Teacher-made
achievement test score
(c) Grades
2. Intelligence 2. I.Q test
3. Attitude 3. Scores on an attitude
scale

17. Example: (EOD)
Variable Definition
1. Reinforcement 1. Describes how the
subjects of the research
to be reinforced
(rewarded) or not
reinforced.

18. It is clear that constructs cannot be directly
seen and are not easily quantifiable, their
presence may be inferred from their
operational definitions.

19. KINDS OF VARIABLES
- Attribute & Active Variables
-Continuous & Discrete
Variables
- Two-Category & Multiple
Category Variables

20. 1. How old are you?
2. Are you a boy or a girl?
3. What is your height ?( ___ in
meters). Would you describe
yourself as a “tall” or “short”?
4. What is your weight?
5. To what

21. Attribute Variable Active Variable
Traits & characteristics Manipulative variable
Intelligence, status & attitude Usually defined in terms of
an EOD
Organization & inanimate
objects
Non– manipulative variable
Measured variable

22. Continuous Variable Discrete Variable
Variables that exists a
continuous range of values
Measurement and
classification are possible only
in whole units
Ranges from smallest to the
largest possible amount
Measurement is theoretically
possible at any point along
continuum

23. Two-Category Variable or
Dichotomous Variable
Example:
Gender (boy or girl)
Religion (Catholic or non Catholic)
Ethnic group (Tagalog or non-
Tagalog)

24. Multiple Category Variables
Example:
Religion (Catholicism, Islam,
Buddhism or
Protestantism)

25. These Two-Category Variables (Dichotomous
Variable) & Multiple Variables are expressed in
terms in discrete and continuous categories.
Example: Continuous &multiple categories
-Height (tall, average, or short)
-Weight (heavy, average, or light)

26. Variable Traits
- Exhaustive
(includes all possible answerable responses)
- Mutually exclusive
(no respondents should be able to have two
attributes simultaneously)

27. Types of Data According to
Measurement Scale Used
Nominal Data
Ordinal Data
Interval Data
Ratio Data

28. Nominal Data
Categories of qualitative variables like gender,
religion, and marital status maybe assigned to
numerical codes in order to identify the members
with in a given class.
Example:
1- Male
Gender = 2- Female

29. Nominal Data
- these codes for nominal data do not
possess arithmetic properties such as equality
and inequality.
STATISTICAL TOOLS/ TECHNIQUES
-chi-squares test, and the contingency
coefficient

30. ORDINAL DATA
-Ordinal data are those that may be
ordered in some way, highest to lowest or vice
versa.
- They reflect the rank order of the
individual rank.
Example:

31. ORDINAL DATA
STATISTICAL TOOLS/ TECHNIQUES
- median, centiles, Spearman rank-order
correlation coefficient, Kendall’s tau, Kendall’s
coefficient of concordance, Mann-Whitney U test,
& Kruskal-Walls One-Way Analysis of Variance

32. INTERVAL DATA
- share the same properties with those of
ordinal data with one additional property: the
distances between the points or the interval
scale are equal.
Examples: Academic Achievement, Intelligence
test scores, and Personality Test scores

33. INTERVAL DATA
STATISTICAL TOOLS/ TECHNIQUES
- mean, standard deviations, variance,
Pearson product-moment correlation, z-test, t-
test, and F test.

34. RATIO DATA
- the highest type of measurement scale
-possesses an actual or true zero point
-mathematical and statistical manipulated

35. RATIO DATA
STATISTICAL TOOLS/ TECHNIQUES
- mean, standard deviations, variance,
Pearson product-moment correlation, z-test, t-
test, and F test

36. DEPENDENT AND INDEPENDENT
VARIABLE
Independent Variable is a variable that
affects ( or is presumed to affect) the dependent
variable under study and is included in research
design so that its effect can be determined.
Dependent Variable is one that is affected
or expected to be affected by the independent
variable. (Fraenkel & Wallen, 1993)

37. EXOGENOUS & ENDOGENOUS
VARIABLES
EXOGENOUS VARIABLE ENDOGENOUS VARIABLE
-Variable whose variability is
assumed to be determined
by causes outside the causal
model.
- This variable is treated as
pure independent
variables.
(Kerlinger &Pedhazur,1973)
- Variable whose variation is
explained by exogenous
or endogenous variables in
the system.
- This variable is treated as
dependent variable on
one set of variable and
independent variable in
relation to other variables.
(Kerlinger &Pedhazur,1973)

38. Teacher’s
Educational
Attainment
Teacher’s
Teaching
Competence
Student’s
Academic
Achievement
In a sample illustration above, “teacher’s educational
attainment” is an exogenous variable while “teacher’s
teaching competence” is an endogenous variable.
“Teacher’s teaching competence” acts as dependent
variable with respect to the independent variable
“teacher’s educational attainment”; however, it acts as an
independent variable with respect to the dependent
variable “student’s academic achievement.”

39. MODERATOR VARIABLE
-it is a secondary independent variable
- it is that factor which is measured,
manipulated or selected by the experimenter to
discover whether it modifies the relationship of the
independent variable to an observed
phenomenon.

40. Example:
If the researcher is interested in
knowing the effects of the independent
variable X on the dependent variable Y, but
suspects that a third factor Z alters or
modifies the relationship between X & Y, then
Z is considered the moderator variable ( DE
Jesus et al.,1984)

41. EXTRANEOUS VARIABLES
- Exist in all studies and can affect the
measurement of study variables and the
relationship among these variables (Burns & Grove,
1995)
-They are classified as recognized or
unrecognized and controlled or uncontrolled.

42. Confounding variables are extraneous
variables which either not recognized until the study
is in progress, or are recognized before the study is
initiated but cannot be controlled.
In some cases this kind of variable can be
measured during the study and can be controlled
statistically during the analysis but in other cases
this cannot be controlled or measured directly.
Intervening variables are confounding
variables that intervene between the cause and
effect.

43. Example
In a study of students’ demographic
characteristics on their test performance, variables
such as anxiety, fatigue, unpreparedness, or
motivation are called intervening variables.
They cannot be observed directly but they
influence student’s test performance.

44. ENVIRONMENTAL VARIABLES
- are extraneous variables composing the
setting where the study is conducted, such as
climate, family, health care system, and
governmental organizations (Burns & Grove,
1995).

45. DEMOGRAPHIC VARIABLES
- these are attributes or characteristics of
subjects or respondents that are gathered to
describe the sample of the study.
- these variables are analyzed to provide a
typical picture of the respondents of the study.
Examples:
Gender Educational Attainment Religion
Age Civil Status Monthly Income
Years of Experience