A lot of the descriptions that give an expression for how certain numbers are calculated seem to be slightly incorrect.
One small example being, in order to spy on two lovers at the Union Lake Upper Platform in the shapeshifter village you need to pass a stat check of 2 * Agility + Luck + Random 100-sided dice. At least this is the expression according to the game. In actuality, the expression is 2 * Perception + Luck + Random 100-sided dice. Of course there are other ones as well, especially with skills, and probably more I haven't seen since it's pretty frequent in the code. I'd probably double check all the descriptions' expressions match the mathematical expressions used in the code for skills, stat checks, etc..