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Miss Chance calculation

PostPosted: Fri May 22, 2015 5:38 am
by Stalk
wowwiki.com wrote:The difference between the attacker’s Attack Rating and the defender’s Defense determines the chance to miss a melee or ranged attack. When a player or mob attacks a player, the chance is a base 5% plus 0.04% per rating difference. Level is not a factor except when attacking a mob level 9 or lower. Miss chance against a low-level mob is a percentage of normal equal to the mob’s level divided by 10. When a player or other mob attacks a mob, the change in miss chance is 0.2% per rating difference if that rating difference is 11 or more. If the rating difference is 10 or less then the change in miss chance is 0.1% per point. If the attacker and defender have the same ratings then of course the total miss chance will be 5%.


Source: http://www.wowwiki.com/Miss?oldid=821897

Some developer has changed something with the defense vs. weapon skill formula recently and it is making a slight difference in endgame PvE content and a huge difference in my ability to solo farm lower level dungeons. Mobs that are excessively below a player's level are able to hit in melee with very high frequency. I did some tests after getting wrecked by mobs in level 40+ dungeons that I could normally solo with ease and found that the miss chance calculation from defense is using the default multiplier of .04% miss chance per +1 defense skill. However, when the difference between weapon skill and defense is greater than 10, the multiplier should be .2% per defense skill above the attacker's weapon skill. This change has such a detriment on gameplay that melee classes would now have 2.4% more hit chance against raid bosses than previously. For instance, I let a level 7 mob in Dun Morogh hit me about 720 times from behind and the statistics that Recap compiled was that the mob had a 15.7% miss chance. If we use the WRONG multiplier here, the miss chance that we calculate is 5% (base) + [ 300 (my defense skill) - 35 (mob weapon skill) ] * .04% = 15.6%, which is approximately what I discovered. Using the CORRECT multiplier the miss chance would be closer to 5% + (300 - 35) * .2% = 58%.

Please fix this ASAP. It is a major bonus to melee player damage in raids and quite silly that a group of 3 melee players that are 20 levels below me can hit a level 60 player with ease because this server has incorrect mechanics.

Edit: Actually, some information in this post can be ignored. The formula was for players vs. mob only from what I can find but I really wanted to open up discussion just in case players are noticing their ability to hit higher level mobs at a consistent rate. I currently cannot find any information about mob vs. players that would suggest additional miss chance based on level difference or the weapon-skill/defense difference. I suppose that I have been spoiled by the private server experience over the past 7 years. It seems to be working as intended when mobs attack players until I can find other sources that state otherwise. However, it is a good idea to keep a watch on hit/miss statistics against higher level mobs to monitor the effect of this change in PvE.

Re: Miss Chance calculation

PostPosted: Fri May 22, 2015 9:48 am
by rinron
good post. i also felt while leveling up that hitting red or ?? npcs or players was easier than it should be. never collected any data to back up my feeling though.

Re: Miss Chance calculation

PostPosted: Fri May 22, 2015 10:09 am
by Hyunckel
It's funny cause as a caster trying to send spells at mobs just one level higher, I get a lot of Resists...

I also noticed that low level mobs still pwn my clothie ass without difficulties. Now I understand why they almost never miss me ><

Re: Miss Chance calculation

PostPosted: Fri May 22, 2015 10:13 am
by Xylon666Darkstar
Good find. I thought I was hitting skull/red's too easily with my lvl 50 hunter, shooting or melee (with 237 2h axe weapon skill in regards to melee). This is truly incorrect and should be addressed.

Be sure to add to bugtracker(however wonky that may be).

Re: Miss Chance calculation

PostPosted: Fri May 22, 2015 2:04 pm
by Stalk
Hyunckel wrote:It's funny cause as a caster trying to send spells at mobs just one level higher, I get a lot of Resists...

I also noticed that low level mobs still pwn my clothie ass without difficulties. Now I understand why they almost never miss me ><


I was just referencing melee hit. I did not perform a test for spell logic yet. However, I did notice certain bosses in lower level dungeons hitting me with spell abilities when I should've seen a massive amount of resists. This only seemed to happen when the spell would have a DoT or debuff component attached to it like Noxxion in Maraudon.

Re: Miss Chance calculation

PostPosted: Fri May 22, 2015 2:32 pm
by Keftenk
Bugtrackerrrr

Re: Miss Chance calculation

PostPosted: Sat May 23, 2015 12:34 am
by Stalk
Keftenk wrote:Bugtrackerrrr


You can put it on the bugtracker if you want. I'm tired of wasting my time when the bugs that I post do not even get discussed or even acknowledged. I would now rather open up the bugs for discussion by players that care on the forums.