AI personalities vs. RoM ruler personalities

[ocelot64]

What takes precedence in seemingly contradictory pairings? The AI personality or the ruler personality that came with Rights of Man?
Prime example for me: Militarist rulers usually are much more aggressive than other AI personalities. But assume this ruler gets the RoM trait "Calm" which makes a an AI ruler "less likely to start wars". So this seems a bit contradictory to me. So how is this "conflict" solved? Does the AI personality take precedence in calculating the probability of a ruler to declare war or is the "calm" ruler trait/personality the determing factor that this ruler is less likely to declare war? Or third option by making both attributes multiplicative: A calm Militarist is less likely to declare war than a non-calm Militarist, but more likely to go to war than a calm ruler with a different AI personality (Administrator, Diplomat, etc).

This is something I've been curious about for quite some time now and I hope, you can enlighten me.

 

[zedyue]

I'm not looking in the files so don't trust me, but a lot of EU4 ai decisions are based on 'weights'. eu3 and ck2 used them a lot too

like base chance to do 'thing' = 1
calm = times 0.9
wroth = times 2.0
diseased = times 0.2

etc, the result would be based on all the active modifiers that are =yes multiplied together, so like a weight of 0.5 total, so it has a half chance of pulse firing or when called has a half chance of happening

but again I could be wrong it's not something I've looked up but this is something I would give a good chance to be true

 

[Chaingun]

It's unfortunately varying from case to case. In most cases, the code for the old personalities will still be active doing the same things as it did, leading to potential contradictions with ruler personalities. In some other cases, new code depending on ruler personalities is supplanted by old personalities if DLC isn't present. Overall, I don't think it's more than a flavor issue though, with maybe some exception.

When it comes to numerical modifiers (particularly internal computations, rather) it can indeed be the case that additions or multiplications cancel out each other from contradictory personalities.