Repeat Measures Flashcards
1
Q
what is a repeat measures design?
A
when the same participants are used in each condition
2
Q
what are the advantages of a RM design?
A
efficient, don’t need to balance pts, high control, economical
3
Q
what should you watch out for with a RM design?
A
practice effects, order effects, violation of sphericity
4
Q
what is sphericity?
A
errors should be independent and variances between should be equal
5
Q
how do you test for sphericity?
A
greenhouse geisser / 1 = spherical / <1 = deviated
6
Q
how do you control for sphericity? what should you do?
A
adjust the degrees of freedom / df x estimates
7
Q
do you want sphericity?
A
yes
8
Q
what result line do you report from when doing F (df1, df2) = F , p =
A
the GG line
