Guild Wars 2

Who knows which are the formula for DPS and effective power?!

Such a thing is so situational that a formula is impossible to make.
There is formula for direct damage:

Damage done = (Weapon strength) * Power * (skill-specific coefficient) / (target's Armor)

Cond damages like:
Burning:

0.155 * Condition Damage + 1.55 * Level + 7.5

Bleeding:

0.06 * Condition Damage + 0.25 * Level + 2

And so on.

On each profession sub forums you’ll probably end finding the meta build and rotations for max damage, but a global formula doesn’t exists.