;calculate differenz between the two classes

do lb1 i=1,83
x50=x0

su
groups/grp{***x50}/avg001
groups/grp{***x50}/avg002
groups/sub{***x50}
*

ud n,x31
groups/grp{***x50}/sel001

ud n,x32
groups/grp{***x50}/sel002

ep tt
groups/grp{***x50}/avg001
groups/grp{***x50}/var001
x31
groups/grp{***x50}/avg002
groups/grp{***x50}/var002
x32
groups/sig{***x50}

lb1

en d