Compute z = x / max( y) where max( y) is over all cases

DATA LIST LIST /x y.
BEGIN DATA
2 5
3 3
4 4
END DATA.
LIST.

COMPUTE nobreak=1.
AGGREGATE OUTFILE='c:\\temp\\temp.sav'
	/BREAK=nobreak
	/maxy=MAX(y).
MATCH FILES FILE=*
	/TABLE='c:\\temp\\temp.sav'
	/BY=nobreak.
COMPUTE z=x/maxy.
EXECUTE.