Type of variable
Bambang Subali
Biological Edu Dept
The Type of Variable
a. Independent variable: variable influence or
have effect on dependent variable
b. Dependent variable: variable influenced or give
response to independent variable
c. Antecendent variable: variable influence on
independent variable
d. Random variable: variable does not influence
on dependent variable
e. Moderator variable: variable influence on
independent and dependent variables
The Kind Of Variable
f. Suppressor /nuisance/extraneous/variable: variable
besides on independent variable which influence
on dependent variable
This variable must be controlled become random
variable/control variable
In the research method, these variables must be
described explicitly on procedure
g. Substitute variable/observation: replacer
variable/observation of dependent variable if the
dependent variable is difficult to be observed
h. Covariate variable/concomitant variable/co-variable:
suppressor variable that uncontrollable, but it must
be collected and calculated in data analysis
THE INFLUENCE OF PHOSPHATE FERTILIZER CONSENTRATION ON THE PRODUCTIVITY OF
CORN SEED
i. IND VAR : PHOSPHATE FERTILIZER CONSENTRATION  AS FACTOR
DECLARE THE NUMBER OF FACTOR LEVEL  3 LEVEL IN LABORATORY EXPERIMENT: 0
G/POLYBAG, 2 G/POLYBAG, 4 G/POLYBAG , OR
4 LEVEL IN FIEPD EXPERIMENT: 0 KG/HA, 10 KG/HA, 20 KG/HA, 30 KG/HA
II. DEP VAR (AS PRIMERY OBSERVATION ): PRODUCTIVITY OF CORN SEED CAN BE
MEASURED (WITHOUT SUBSTITUTE OBSERVATION/PARAMETER)
III. SUPPRESSOR VAR :
A. FROM OBJECT
1. VARIETY OF CORN  MENTION THE VARIETY OF CORN IN THE RISEARCH TITTLE
2. VIABILITY OF CORN SEED  DECLARE THE VIABILITY OF CORN SEED IF THE
EXPERIMENT STARTED BY PLANTING THE SEED (OR DECLARE THE SEEDLING SIZE 
THE HEIGHT OF SEEDING IF EXPERIMENT SRARTED IN THE SEEDLING CONDITION)
B. MEDIA
1. MEDIA DETERMINED BY LOCATION  DECLARE LOCATION OF EXPERIMENT (WONOSARI
 LIME SOIL , , PONTIANAK  PEAT SOIL)
2. LABORATORY EXPERIMENT
a) MEDIA
1) SOIL TYPES  DECLARE THE SOIL TYPE IN THE RESEARCH PROCEDUR
2) ADDITIONAL DROPSY FERTILIZER  DECLARE THE ADDITIONAL DROPSY
FERTILIZER ON THE SOIL
3) THE SOIL HOMOGENITY  DECLARE THE SOIL WAS MIXED IN ORDER TO
HOMOGEN
4) POLYBAG SIZE  DECLARE THE VOLUME OR DIAMETER OF POLY BACK
5) THE SOIL VOLUME  DECLARE THE SOIL VOLUME IN EACH POLYBACK
6) DAILY ADDITIONAL WATER  DECLARE ADD WATER UNTIL THE SOIL BECOME
SATURATED.
C. CLIMATIC FACTOR
1. FILED EXPERIMENT
DETERMINED BY MONTH OF EXPERIMENT IS IMPLEMENTED)
2. LABORATORY EXPERIMENT
CLIMATE FACTOR DETERMINED BY THE CONDITION OF GREEN HOUSE
D. MEDIATOR VAR
a) AS EXPLANATORY VAR (IF DATA WERE
COLLECTED)  DRY WEIGHT OF ROOT, STEM AND
LEAFS
b) AS INTERVENING VAR (IF DATA WERE NOT
COLLECTED  TO DESCIBE ON THE LITERATURE
SUTDY)  THE CON SENTRATION OF PHOSPHATE
ON THE SOIL AFTER FERTILIZATION, INTENSITY OF
ROOT ABSORBSION, INTENSITY OF METABOLISM
PROCESSES, LOCATION OF DEPOSITION OR
ACCUMULATION THE METABOLISM RESULT
D. RANDOM VARIABLE  EXAMPLE: SEX OF
RESEARCER, UNIFORM OF RESEARCHER, SIZE OF
VERTILIZER CONTAINER,
THE INFLUENCE OF THE LENGTH EXPERIENCE USING THE
MASK WITHOUT STRAP IN THE TRADITIONAL DANCING
ON THE SLOPE OF THE INCISOR TEETH
Indep. Var
:?
Dep. Var : ?
Suppressor Var: ?
Moderator var: ?
Mediator var  Explanatory and intervening var?