Is there a way to get the residual variance from the feat output? I had
thought it was the sigmasquareds volume, but that seems not to be the
case. I say that because I ran feat, saved the residual, and computed
the residual variance, and it was different than sigmasquareds. The
residual variance was always more than sigmasquareds, but this ratio
varied across space (see link below). In particular, the ratio was close
to 1 in white matter, but sigmasquareds was somewhat less than the
residual variance in gray matter. Is the residual variance stored
somewhere else? If not, I can script it myself. And what is the
interpretation of sigmasquares?
thanks
doug
ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/feat.var-ratio.gif
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Douglas N. Greve, Ph.D.
MGH-NMR Center
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