Some quick questions about stances

Could someone go a bit more in depth as to what the Evasive and Aggressive stances do mechanics wise? Is the speed change a %? Is the increased damage a result of moving slower so more shots are fired or are the projectiles peirceing armour, or actually doing more base damage? Is less damage from Evasive a result of an accuracy penalty on the attacker, or pure chance due to moving faster? Do these stances affect RNG and Ballistic weapons equally? etc. etc.

Also, do stances have any effect on capitol ships? Will my frigates/carriers/Mothership move faster and take less damage when on Evasive? Will they move slower and do more damage on Aggressive? Due to their size is this going to affect ballistic weapons at all?