Dear Christopher,
> I am running SPM96, using a covariate for global normalization. If I
> choose grand mean scaling to 100 and save normalized data, what will
> units of response reflect: percentage of the global covariate?
The units in this instance will be the same as the original image
values (e.g. counts/sec or T2* signal) scaled so that the grand mean is
100. They can be thought of as percentages of the grand mean.
> I am assuming that under these circuamstances I can still use SE{Y} for
> one group to calculate an effect size for the mean effect in the other
> [for a given SPM]- yes?
Absolutely.
I hope this helps - Karl
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