Skirms

Skirm pop efficiency: https://i.imgur.com/pEFpOjo.png

Skirm cost efficiency: https://i.imgur.com/for8WAq.png

Skirm gold efficiency: https://i.imgur.com/IDaMRae.png

pop efficiency: turk e genitour > e genitour > viet i skirm > i skirm > e skirm

cost/gold efficiency: turk e genitour > viet/byz i skirm > e genitour > i skirm > e skirm

Archers

While these calculations do take into account accuracy, the calculations don't take into account damage done by missed arrows (missed arrows deal full damage if they happen to hit the intended target, and half damage if they hit another target).

This means that arambai, longbows, and gunpowder units would perform better than the tables suggest. A degree of inaccuracy might even be a good thing when firing with a group of units at a group of units (because of overkill).

Archer pop efficiency: https://i.imgur.com/4OX3n7Z.png

Archer cost efficiency: https://i.imgur.com/G1iJq9t.png

Archer gold efficiency: https://i.imgur.com/AThkqDn.png

pop efficiency: HCA > arb > hand cannon

HCA pop efficiency: turk HCA > tatar HCA > magyar HCA > HCA > mongol HCA > viet HCA > hun HCA

arb pop efficiency: ethiopian arb > italian arb = viet arb > arb

HC pop efficiency: turk HC > spanish HC > HC

.

HCA gold efficiency: turk HCA > tatar HCA > magyar HCA = HCA > viet HCA > mongol HCA = hun HCA

A lack of guilds hurts a lot (e.g. for mongols and for huns).

arb gold effiency: persian xbow > mayan arb > ethiopian arb > italian arb = viet arb > arb

HC gold effiency: turk HC > italian HC > spanish HC > HC

UUs

UU pop effiency: ele archer > war wagon > rattan > camel archer > mangudai > conq > geno xbow > kipchak > plume > chu ko nu > arambai > longbow > jani > slinger

UU gold efficiency: ele archer > war wagon > rattan > camel archer > geno xbow > kipchak > plume > mangudai > conq > chu ko nu > longbow > arambai > slinger > jani

Full table

Full pop efficiency: https://i.imgur.com/ts0Z7eA.png

Full cost efficiency: https://i.imgur.com/7QdhdIy.png

Full gold efficiency: https://i.imgur.com/OoO1UH7.png