Is there anywhere an explanation on what the stats and some other things like guard aggression, control do and what they affect?
If you go to the cafeteria and guard room (the first doors up and down from your office) the various NPCs explain what stats are / do. Generally Guard aggression increases the number of guards who so up as enemies (in mat least in the guard only fights by the office and office invasion) and guards stats. So higher guard aggression means the guards are harder to beat (or beat off).
Control affects your order change per day, order is changed by the amount of control you have, so having -5 control reduces order by 5 per day. Depending on your difficulty setting, passives, and edicts you can get positive control increasing order per day, but it's relatively hard to do.
Some of the stats aren't obvious from the in game descriptions, but they are there you just need to find the NPC that talks about the specific one.