Hi Paul,
The contrast coefficients are the linear combination
specified in the contrast. Single line contrasts are
very simple to convert to 3dcalc commands. Consider
some examples:
-gltsym 'SYM: house -face'
-gltsym 'SYM: 0.7*house +0.3*face'
-gltsym 'SYM: face'
-gltsym 'SYM: 0.5*house +0.5*face -doughnut'
-gltsym 'SYM: scary[2] -scary[1]'
The second contrast might be converted using:
3dcalc -a stats+tlrc'[house#0_Coef] -b stats+tlrc'[face#0_Coef]' \
-expr '0.7*a+0.3*b' -prefix useless_contrast
See Bob's
DeconSummer2004.html document for details
and more examples.
- rick
