About 10 years ago, one of the developers posted the formulas for "avoidance ac"
Formulas Here
The Meat of It:
Quote:
Displayed AC Value is equal to what we'll call your 'AC Sum' added to your 'Computed Defense' multiplied by 1000 then divided by 350 plus 497. What that looks like as an equation is:
(1000 * (ACSum + ComputedDefense)) / (350 + 497)
Because it's shorter, I'll now explain how to find your 'Computed Defense'. Think of the 'Computed Defense' as 'Avoidance AC', it is basically how hard it is to land a hit on you. Despite this fact, this value gets rolled into displayed AC. To calculate this, take your defense skill multiplied by 400 then divided by 225, add your 'Agility Bonus', add the capped sum of your 'Item Avoidance', then multiply this value based on your 'Drunkenness Reduction'. If this value is less than 1, return 1 instead. I'll display this as an equation then break down the steps in the next paragraphs:
Step1 = (DefenseSkill*400) / 225
Step2 = Step1 + 'Agility Bonus'
Step3 = Step2 + 'Item Avoidance'
Step4 = Step3 * 'Drunkenness Reduction'
If Step4 < 1: 'Computed Defense' = 1
Otherwise 'Computed Defense' = Step4.
Your 'Agility Bonus' is calculated as your 'Functional Agility' minus 40, multiplied by 8000 divided by 36000 added to your heroic agility divided by 10. Your 'Functional Agility' is defined as your capped stat + the amount of heroic Agility you have. I'll use the values on my avatar as an example, the second tab of my inventory window states that I have 1002/900 base agility +395 heroic agility. My 'Functional Agility' is 900+395, 1295, the value that is displayed on the first tab of my inventory window. In equation form it looks like:
Step1 = (8000 * (FunctionalAgility-40)) / 36000
Step2 = (HeroicAgility / 10)
'Agility Bonus' = Step1 + Step2
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Now, this is from 2014 EQLive code and while it gives a comparison to defensive skill, it does not say much in the way of effectiveness.
This is the only agility parse that I've seen demonstrate much of an effect. And well, it's pretty minimal.
Quote:
I've heard alot that normal agi doesn't do anything, but I wondered, so I did 2 9 hour parses, with the only difference being by agi score.
Low score was 710 and the high score being 962. No gear changed, this was done by having no planar power, and max planar power/planar agi.
Both times during the test, I had max CA/CS, armor of wisdom, and staff block.
My Low agi parse had a miss rate of 10% after 9 hours
The high agi parse (962) had a miss rate of 10.8%
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You can read the discussion in the thread as well. The difference in block chance basically negates the observed difference.