Dear SPM experts
Is there any rule of thumb to decide whether two nuisance covariates are
redundant (correlated). E.g., in our VBM study gender and total GM volume
correlate with 0.51. Are they enough redundant in order to cancel one of the
two nuisance covariates? Should I only cancel one covariates when this
correlation is significant? When I cancel one, should I cancel the covariate
with less variability, i.e. gender?
Thanks in advance
Best regards
Juergen
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Juergen Haenggi
Ph.D. (Dr. des.)
Division of Neuropsychology
Institute of Psychology
University of Zurich
Binzmuehlestrasse 14, PO Box 25
8050 Zurich, Switzerland
0041 44 635 73 97 (phone office)
0041 76 445 86 84 (phone mobile)
0041 44 635 74 09 (fax office)
BIN 4.D.04 (office room number)
[log in to unmask] (email)
http://www.psychologie.uzh.ch/neuropsy/ (website)
http://www.juergenhaenggi.ch (private website)
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