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Chpt 11


Department
Psychology
Course Code
PSYB01H3
Professor
Connie Boudens

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Chapter 11
Single Case Experimental Designs
not the same as case study
You can replicate with different individuals but do not group your findings
Complex stat analysis is not required
Uses a time series design; individual is measured over time (baseline control period)
Manipulation is treatment administered (treatment period) and any change can be
attributed to manipulation
However we must acknowledge that can be due to alternate explanation
SOLUTIONS:
Reversal Design:
A(baseline period)B (treatment period)A(baseline period)
If manipulation did occur, reversing it and withdrawing treatment should bring it back
down
Can also do ABAB or ABABAB because 1. More powerful evidence that change not
due to something else and 2. Unethical to end with no treatment
SOLUTION:
Multiple Baseline Design:
Used when taking away treatment is unethical for example an alcholic
Instead you will show manipulation
1. Across subjects (different times among the same subjects
2. Across behavour (dur ing socializing and during grooming)
3. Across situations (at home and at work)
Program evaluation: research done to show effectiveness of programs
5 types of Evalua tion:
1. Need assessment
2. Program theor y
3. Process evaluation
4. Outcome Evaluation
5. Eff iciency assessment
Quasi-Experimental Design
Used when there are limits to time, budget and data collection options
Do not meet requirements for controlling extraneous variables
No random assignment (naturally occurring)
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