Dear SPM'ers
We have tried to use SPM99 to investigate linear correlations between
regional brain uptake of SPECT tracer in our psychiatric samples (OCD
and major depressive patients) and the severity of symptoms as assessed
using standardized rating scales.
We have attempted a design that used to work with SPM96, which is
“multi-subject: covariates only” but this did not work now (error
message: “unestimable block effects”). We have also attempted the
”single subject: covariates only” option with no success either
(“segmentation fault”).
I wonder if we could have some help on that. Many thanks...
Griselda Jara Garrido
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