yes, that is exactly how you write it.
(a-b)-(c-d)= a -b -c +d
sophie
Quoting Simone Bosshardt <[log in to unmask]>:
Dear SPMers
I have a design matrix with the 5 conditions A, B, C, D, E. Now I would
like to calculate the "double" contrast of (A-B)-(C-D).
Is it correct to write it as 1 -1 -1 1 ?
Thanks for any help!
Cheers,
Simone
Simone Bosshardt, Dipl. Natw. ETH
Division of Psychiatry Research
University of Zurich
Lenggstr. 31
8029 Zurich
phone: +44 1 3842689
fax: +44 1 3842686
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Sophie Lafaille, B.Sc.(Hons.), M.Sc.
Research Officer II, Speech Fluency Laboratory 1059
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