Not that I am aware of. I know from comments by the EB team that the armour value is calculated by adding up the modifiers of individual pieces of equipment (+2 for a helmet, +2 for a greave, etc.). The same formula is used for all units (though unarmoured barbarian close-combat infantry get an additional +1 armour).
Lethality depends solely on the weapon used, but I don't know how the other stats are calculated.
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