15
end data.
sort cases by x.
-aggregate /missing=columnwise /document /presorted/break=x(a) /z'label for z'=sum(y)/foo=nu.
+aggregate outfile=* /missing=columnwise /document /presorted/break=x /z'label for z'=sum(y)/foo=nu.
list.
EOF
if [ $? -ne 0 ] ; then no_result ; fi