10. Repeated Measures and the GLM Flashcards
1
Q
Systematic variance is created by…
A
Our manipulation
2
Q
Unsystematic variance is created by…
A
unknown factors
3
Q
What are two benefits of repeated measures designs?
A
- Sensitivity - unsystematic variance is reduced, more sensitive to experimental effects
- Economy - less pts needed
4
Q
What is sphericity?
A
The differences between pairs of groups should have equal variance (the degree to which the variance of differences between pairs of conditions are similar)
5
Q
Given that E quantifies the deviation from perfect sphericity, we correct the df by…
A
the degree to which spehercity is violated
6
Q
Repeated measures designs violate the assumption of…
A
independent errors
