Single Subjects Research
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SINGLE SUBJECT
RESEARCH
PREPARED FOR:
DR JOHAN @ EDDY LUARAN
PREPARED BY:
AFZA ARRMIZA BINTI RAZIF [2013697158]
HANIFAH BINTI RAMLEE
IZYAN NADHIRAH BINTI WAHID
MAIZATUL AKMAL BINTI ZULKIFLI
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DEFINITION
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SINGLE SUBJECT DESIGN
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CHARACTERISTIC
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Figure 14.2 A-B Design
As you can see, five measures were taken before the
intervention and five more during the intervention. Looking at
the data in figure 14.2, the intervention appears to have been
effective. The amount of responsiveness after the
intervention increased markedly.
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Threat to Internal Validity in Single-
Subject ResearchIt involve the :
The length of the baseline and intervention conditions
The Number of Variables Changed When Moving from One
Condition to Another
The Degree and Speed of Change
The Return to Baseline Level
Independence of Behaviour
Number of Baselines
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CONDITION
LENGTH
Refers to how long the baseline and intervention conditions are in effect.
The number of data points gathered during a conditions.
Minimum three of data point to establish a clear pattern or trend.
As a hypothesis,in a certain period or condition of length,the researcher need to gathered enough data as it will establish the clear pattern
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Figure 14.10 (a)
Figure 14.10 (b)
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NUMBER OF
VARIABLES
CHANGED WHEN
MOVING FROM ONE
CONDITION TO
ANOTHER
Only one variable should be
changed at a time when
moving from one condition
to another
When analyzing a single –
subject design,it always
important to determined
whether only one variable
at a time has been changed
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DEGREE AND
SPEED OF
CHANGE
In single-subject
research,the stability is
important
The data change at the
time the intervention
condition is implemented
influenced the stability of
baseline
(when the independent
variable is introduced or
removed)
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Figure 14.11(a)
Figure 14.11(b)
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Figure 14.11(c)
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RETURN TO
BASELINE
LEVEL
The subject’s behaviour did
not return to the original
baseline level suggest that
the one or more extraneous
variable may have
produced the effects
observed during the
intervention condition
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Differences in Return to Baseline
Conditions
Figure 14.12(a) Figure 14.12(b)
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NUMBER OF
BASELINES
In order to have a multiple –
baseline design,researcher
must have at least two
based line
Baseline begin at same
time,the intervention occur
in different time
More baseline and
intervention will lead to
invalid conclusion
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NUMBER OF
BASELINES
The greater number of baselines,the greater the probability that the intervention is the cause of any change in behaviour
The more baselines,thereare,the longer the later behaviours must remain in baseline
The fewer the number of baseline,the less likely we can conclude that is the intervention rather than some other variable that causes any change in behaviour
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CONTROL OF
THREATS TO
INTERNAL
VALIDITY IN
SINGLE-SUBJECT
RESEARCH
Single-Subject designs are
most effective in controlling
for :
Subject characteristics
Mortality
Testing
History
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EXTERNAL
VALIDITY IN
SINGLE-SUBJECT
RESEARCH:THE
IMPORTANCE OF
REPLICATION
Single subject studies are
weak when it comes to
external validity
Total rely on replications-
across individual instead of
groups
The result worthly of
generalization