Avoidance Macro

guys

a pal told pased me thismacro that makes wow calculate ur avoidance

my question is... are thecalculations right?

/script DEFAULT_CHAT_FRAME:AddMessage("Need 102.4 combined avoidance. Currently at:",0.8,0.8,1)
/script DEFAULT_CHAT_FRAME:AddMessage(GetDodgeChance()+GetBlockChance()+GetParryChance()+5+(GetCombatRating(CR_DEFENSE_SKILL)*150/355 + 20)*0.04,1,0.5,0)

question: what defense skill means? it is true that defense rating also helps in the uncrushability stats?

moved to the add-on/ui/macro forum.
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I believe the macro is listed in Eanin's uncrushability guide, but I just use the Tankadin mod. It shows a constant display of how crushable (or not) I am. I'd suggest using that rather than the macro.

I believe this one is better: