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You want the positives to sum to 1 and the negatives sum to 1.

Best Regards, Donald McLaren
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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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On Tue, May 10, 2011 at 4:59 PM, Andrew Westphal <[log in to unmask]> wrote:
Dear Dr. McLaren,

Thanks for responding to me. The design is event-related with varying numbers of sessions due to blocks being removed due to movement and such. Is the weighting with whole integers still a problem in the second level analysis if the contrast sums to zero? For example, 2 session subject (1 -1 0 0 1 -1 0 0) and 5 session subject (1 -1 0 0 1 -1 0 0 1 -1 0 0 1 -1 0 0 1 -1 0 0).

Andrew