Dear Rachel,
Rachel Mitchell <[log in to unmask] >said:
> Is it true that for a random effects analysis of fMRI data that it is
> preferable that you present subjects with the set of experiments in
> the same i.e. fixed order rather than counterbalance them?
This is a question relating to experimental design and repeated
measures analysis of variance. The simple answer is 'no, it is not
true'. The longer answer is that designs which use counterbalancing or
randomising orders of conditions may perhaps allow better estimation of
condition effects in the context where there may be carry-over effects
from preceding conditions.
Best wishes,
Ian
---
Ian Nimmo-Smith
MRC Cognition and Brain Sciences Unit
15 Chaucer Road
Cambridge CB2 2EF
+44 1223 355294 x 710
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|