Initial observations characterizing the data
The PGFDA seems to treat all weapon types completely interchangeably. All weapon types appear equally often and with the same distribution, and there are no correlations between different weapon types or between weapon types and alien species in the past missions. The only tactical decision they make is to send more soldiers when there are more aliens.
The alien species also seem to be acting independently of each other. They each have different distributions in the number of individuals per encounter but each species shows up in about 100,000 encounters and there are no correlations between the presence of any alien species with any other.
Victory is somewhat correlated with number of soldiers which makes sense, but isn’t correlated with specific weapon or alien types. I would guess that each weapon is strong and weak against certain aliens, or maybe some weapons combinations synergize and others interfere with each other such that they all come out to the same average effectiveness when chosen at random like the PGFDA and AM are doing.
I misremembered the May 6 date as May 9 but luckily other people have been asking for more time so it seems I might not be late.
The average number of soldiers the Army sends looks linear in the number of aliens. A linear regression gives the coefficients: 0.40 soldiers by default + 0.66 per Abomination + 0.32 per Crawler + 0.16 per Scarab + 0.81 per Tyrant + 0.49 per Venompede. From here, the log-odds of victory looks like a linear function of the difference between the actual number of soldiers and the expected number of soldiers.
Based on no evidence at all, I will assume this generalizes to the individual weapon types and that each additional soldier of each weapon type increases the odds of victory by some fixed amount depending on the composition of the aliens, but not dependent on the other soldiers already present.
Here’s a guess that can definitely be improved upon but I don’t know if I will
7 Thermo-Torpedos
It’s definitely wrong because
Weapon diversity clearly helps but my model makes that impossible. I’m pretty sure my assumption that the effectiveness of each marginal soldier is the same and only depends on the aliens is wrong, even though it does look true when averaged over all weapon and alien types.