Complex Within Subjects Anova

Question 1

what is a complex within subjects anova

Answer 1

a within subjects anova with more than one IV

Question 2

what does a complex within subjects anova mean?

Answer 2

lots of testing

all participants contribute score to each condition

Question 3

give an example of this type of study

Answer 3

effect stress in different locations on social behaviour
IV 1= stress (high, medium, none)
IV 2= location (home, uni, underground)
DV= behaviour observed
total of 9 conditions looking for differences within the pp in different condition

Question 4

What are the assumptions of this design

Answer 4

normally distributed data
ratio / interval / ordinal
sphericity (similar to variance in between subjects anova)
(equality of variances in differences between levels)

Question 5

why cannot sphericity be violated?

Answer 5

cannot be assessed / violated for 2 level IV studies because there is nothing to compare to. only have w/ 3+ levels.

Question 6

how do you check for sphericity

Answer 6

check sphericity of main effects and interactions Mauchley’s test correlates variances and therefore checks sphericity - we want it to be insignificant

Question 7

explain Mauchley’s test

Answer 7

we have each Mauchleys figure for each main effect and interactions but don’t want to report this- looking for more info.

Question 8

what do you do if there is a significant interaction?

Answer 8

post hoc comparisons, either syntax (add command) / series of t-tests- paired sample t test (within subjects)
have to compute new variable - write basic formula of the 3 variables added together then divide by three. repeat this for the different types of dependent variable.