Can you combine two regressors to get another (e.g. 2*A+3*B=4*C) where A, B, and C are regressors.
Best Regards, Donald McLaren
=================
D.G. McLaren, Ph.D.
Postdoctoral Research Fellow, GRECC, Bedford VA
Research Fellow, Department of Neurology, Massachusetts General Hospital and
Harvard Medical School
Office: (773) 406-2464
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2012/1/25 羽田栄輔
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Dear all,
I have a problem with SPM8:
I would like to use Multiple Regression for PET data with more than 4 covariates.
When using Multiple Regression of SPM for PET data with 4 covariates, the Design Matrix shows ‘’b not uniquely specification” in the parameter estimability at t2nd, 3rd and 4th column other than the first column. Therefore when defining 2nd, 3rd and 4th column at the SPM contrast manager, it shows the error message.
Whereas with 3 covariates, all column are activate and can be defined with SPM contrast manager.
Please could you help me to resolve this problem?
Best regards.
Ei Hane
