How to estimate how much CPU time is parse related DB 9i wide .

Hi,
I'm trying to estimate how much CPU time is parse related and next compare that value after i.e. cursor_cache setting. So far I've found :
parse time cpu
parse time elapsed
in v$sysstat .
Are there good indicators for my needs ?
Basically when I get CPU time from statspack and parsetime_cpu (somehow) i can derive percentage usage.
btw how is 'CPU time' in statspack calculated ?
I'm running AIX DB 9.2.0.8 EE , can take historical data from statspack .
Regards.
Greg

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