Others, such as %crit, %tohit, %spellcrit are much rougher as they dont appear much and then only in small values (1 or 2%). str, int, resists, +spell damage) are pretty reliable since they occur on many items and in large values. These stat mods were obtained by evaluating several thousands of items. So for example 1% Crit = 14 Agility and 5 mana regen/5 = 12 Spirit. Most probably Blizzard uses a different base, but it should not matter, as all that is important is the ratio between the stats, not the absolute value.ĭue to the nature of the formula, an item of the same level can have more of a stat with a low stat mod, than with a high one. The base was taking 100 for +heal, the factors for the other modifiers were reverse-engineered from there. The numbers for StatMod are given in arbitrary units. After summing the series of stats to the 3/2 power, the total sum is taken to the 2/3 power, to keep the ItemValue scale linearly with the item level (not with a power).For example, if we had two green leg items, one with +15 to a single stat and another +9 and +10 on two different stats, their calculated item levels would be 20.5 and 20.6. This isn't too fast of a growth, but it does cause a single high stat to be weighted fairly heavily. It is quite simple, but not so simple that it is just all the stats added together.This calculated item level matches Blizzards item level quite well. Green: ilvl = (ItemSlotValue + 9.8) / 1.21.The end result is a calculated value for item level. The final modification takes into account item quality. Next, this sum is modified by the slot (or item type): ItemValue = *StatMod) 1.5 + (StatValue*StatMod) 1.5 +.It represents the feeling how "good" an item is. The result, the Item Value, is a direct measure for the item's quality. First, the individual stats are each multiplied by their modifiers and taken to the 1.5 power, these terms are summed up and taken to the. This calculation is a three step process. ItemSlotValue - this is the ItemValue modified for the item slot.SlotMod - weighting for adjusting the value of an item based on equipment slot. ItemValue - the total value of the stats on an item.StatMod - the weighting given to a specific stat, this is how stats are compared in value.StatValue - the amount of a given stat on an item.
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