Stat calculations are as stated below.

Strength: Increases melee attack damage.
Agility: Increases critical damage chance (also applies to some skills (arrow, fire blades, shruken)).
Wisdom: Improves all skills.
Dexterity: Increases miss rate of monsters and decreases critical chance of monsters. Increases walking speed by 0.025 (Max: 2.2). Increases arrow damage.
Armour: Reduces taken attack damage by monsters.
Arrow Damage: Increases arrow damage.


Each 1 dex = +0.2% evasion chance from monsters damage.
Each 1 dex = +0.025 walking speed.
Each 4 dex = +1 Arrow Damage
Each 1 dex over +30 dex = +0.5 Arrow Damage
Each 1 dex over +50 dex = +0.5 Arrow Damage
Each 1 dex over +70 dex = +0.3 Arrow Damage

Each 1 agility = +0.2% critical chance.
Each 1 strength = +2 physical damage.
Each 1 wisdom = +1.4 skill damage.
Each 1 armour = -1 monster physical damage.