[VoxBo] Orthogonal contrasts including conditions labeled as zero

[Daniel Y Kimberg]

Ranjani Prabhakaran wrote:
> What would be the appropriate weights for this contrast if I want to
> get a beta value?

Charan gave a detailed answer, here's the one-liner: if you weight
each covariate 0.333, you get the average of the three effects
(betas), while if you use 1, you get the sum.  It may or may not make
a difference which you use, dpending on what you plan to do with the
values.

dan