Offense, Defense, Armor, Resists bars

The stats tab will now state your Offense, Defense, Armor, and
Resistances in real time. Accounts for all offense and defense
modifiers, changes in HP and skill levels, factions, shifts in faction
powers, and all resistance changes.

Your Offense is your offense rating with your equipped weapon.
You can, for example, cast Eagle Eyes and see no change
in offense. Why? You don't have a bow equipped. Eagle Eyes
only helps bows.

Your Defense is your current defense rating, accounting for
worn armor, faction, skills, and all defense modifiers.

Your Armor is the sum of all damage reduction from your 
items and Armor of Gort. Armor is not a flat -X damage, it
is a roll between 33% and 100% of its full value for each
strike. An armor rating of 10 will protect between 3 and 10
per hit, average 6. Armor of Gort has different behavior,
and its armor is only counted if the damage cap it brings
is not better than its own absorption. (Ex: a hit of 5 damage
will be reduced by Gort's armor. A hit of 30 damage will
be capped to 15 before armor by Gort, but it will NOT also
absorb  a few points in addition to the cap, it does not pull
double duty).

Your resists are exactly what you think they are. 20% resist
will reduce that damage type by 20%. A negative value
will increase final damage by that amount.