The graph was originally made by Xerophyte on the EJ forums in this post:

Avoidance Diminishing Returns - Elitist Jerks

The math you are looking for was already done, though not including the changes you requested with IBF, by WhiteTooth/Muphrid.

Reference:

Combat Ratings at level 80 - Page 13 - Elitist Jerks

In the TTL math, it can be shown, and again restated by WhiteTooth in my thread here on tankspot, that if ONLY defense is added it gives MORE avoidance than stacking pure dodge or parry due to the spread out over the DR curves. However, no math has yet been done to include the benifite of defense if parry/dodge are already added (at least that I've seen). So the answer to your question would depend on your already exist gear stats.

My thread:

http://www.tankspot.com/forums/f14/4...han-dodge.html

In the above you can see that defense gives the most avoidance point per point, if it's the only stat added, once you start hitting the DR curves hard. If you already had enough dodge, it would be possible to get more avoidance from parry than defense, or dodge if you had too much parry rather than defense. Also note that the 5.6% crit chance is added in because it's a TTL calculation (an effective 2nd hit until you are crit immune), but even if you take that out, defense still gives more avoidance point per point once you hit the DR curves if it's the only stat added.

IMO the best way currently to figure this out is with rating buster, or simply use the known DR values to figure out what your avoidance would be if you added ____ defense given ____ parry and dodge already on your gear.

Point per point, not including already existing avoidance stats, defense is already the best even before any changes to IBF. But that doesnt mean you should always stack defense over parry or dodge, depends what your current stats are like.

With the advent of DR, the particular "value" of ANY given tank avoidance stat can change such that it's possible for dodge, parry, or defense to be the best thing to stack depending on what you already have on your current gear.

Sorry for not answering your IBF question though, frankly I am ignorant to what it even is (I dont know DK's well).

though, you have given me an itch to solve the same math in my thread above but with a 3rd equation for defense, which would be excessively more complicated and would give you a 3 variable graph instead of a 2 variable graph (3d graph), in which if on any given axis you are above the 3d curve in the graph you should stack more of the other 2 stats, which one to stack is the one least along in its axis at that point.

Sadly I dont have time to do this right now, but maybe in a little while I'll do such a thing.

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