Week 8 - Repeated Measures Designs Flashcards
1
Q
Repeated Measures Design
A
All participants contribute a score at each level of the IV
2
Q
Levels of IV related to time
A
- With intervention
- Natural change
3
Q
Advantages of RMD
A
- Economy of participants
- Sensitivity is enhanced by separating individual differences from experimental error
4
Q
Disadvantages of RMD
A
- Can’t use with all IVs
- Order effects
5
Q
Issues with RMD
A
- Maturation
- History
- Attrition/Mortality
- Order effects
6
Q
Order effects
A
- Practice effect - performance improves on repeated testing
- Fatigue effect - performance declines on repeated testing
- Carry-over effect - one level of IV affects another level
7
Q
Remedies to order effects - Practice and fatigue
A
- Counterbalance or randomise the order to treatments across participants
- prior exposure to measurement before experimental conditions
8
Q
Remedies to order effects - Carryover Effects
A
- Can seldom be controlled
- Using a BG design instead
9
Q
Counterbalancing
A
A sequence of levels is set with each level rotating its position in which it is run by the participants
10
Q
Normality in RMD
A
Is required as in the BG case
11
Q
Independence in RMD
A
not a problem because the same participants participate in each condition, participant effects have been separated out
12
Q
Sphericity in RMD
A
refers to homogeneity across conditions and participants
13
Q
Breaches of Sphericity
A
Traditional model - mauchly’s test of Sphericity
14
Q
Contrasts and Pairwise Comparisons
A
- Planned Contrasts
- Pairwise Comparisons
