is there any such script already created? I have no experience would not know where to start any command donot: S false positives do not care about the truth is to have an approximate number for me to an idea for every few falls artyfac
Iam total out of EasyUO, i wroted such script looong ago and last time updated it 2010.
If you just want it super simple, you could make a simple script looping through itself and scan for Type of Bosses , every time it finds an result counts + 1 and set that Boss on Ignore. I believe this could be handled with less than 20 lines of Code ( Scan Process ) and maybe another 20 for a Graphical Interface or 1-2 more if it just would print Timestamp and Type. If you print it formatable to Excel ( Date | Type ) you could just read it out in Excel, make sum of all and and see what happend when.
Sample could be : Timestamp | Boss1 | Boss2 | Boss3 | Boss4 | Boss5 | DF
and Sample output could be : 07/13/2013 8:34PM | 0 | 1 | 0 | 0 | 0 | 0
In Excel you could seperate line Import throught | and would have  7 Columns. at end you could build a Sum through Excel :-)
Edit : Are you playing Osi or Freeshard?
Osi Chances you can Calculate through UOGuide and Freeshard have almost all the same chances :
        public static int GetArtifactChance(Mobile boss)
        {
            if (!Core.AOS)
                return 0;
            int luck = LootPack.GetLuckChanceForKiller(boss);
            int chance;
            if (boss is DemonKnight)
                chance = 1500 + (luck / 5);
            else
                chance = 750 + (luck / 10);
            return chance;
        }