dear all,
when i try to run a flexible factorial design with subjects (28), replication (4) and group (2) included, for the replication factor always one level disappears from the design matrix—i.e., if i model the interaction between group and replication, all i get is six columns in the design (instead of 8), and if i model the main effect of replication, i end up with three columns only (instead of 4).
where has my level gone? or is there any model-inherent reason for this? i checked the assignment of scans and the factor matrix, everything is fine with it…
thanks a lot in advance, and have a good weekend,
l.
Lars Meyer
Max Planck Institute for Human Cognitive & Brain Sciences
Department of Neuropsychology
Stephanstrafle 1a
04103 Leipzig | Germany
Office | +49 341 99 40 22 66
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Web | www.cbs.mpg.de/~lmeyer
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