I am Andrew Hyer, currently living in New Jersey and working in New York (in the finance industry).
Thank you for writing this! While I got most of the mechanics, I had some amusing misinterpretations of what they meant:
CONTAINS FINAL ANSWER
On further examination, it looks like there are bonuses assigned for the minimum of the three stats A-C (I've been calling these the 'physical stats') and the maximum of the three stats D-F (I've been calling these the 'mental stats').
This doesn't dislodge #11 from the top of the list, but it does move up #2 (whose minimum physical stat is 6) and worsen #19 and #7 (whose minimum physical stat is 2).
My final top 3 is #11, then #19, then #2. (If the fairy in question seems disappointed to see #11, it's probably Amy, and I'll recommend her #19).
Sadly, these are also the same top three candidates, in the same order, as you get by doing none of this work and just running a linear regression.
:(
No stat pairs exhibit interesting effects.
Holly's score is given by the sum of all 6 stats, plus 20, plus a number from 1 to 12. Despite my initial hope that this was a seventh stat, it is not: or, at least, it exhibits no correlation with success.
Amy's score actually does seem to have some small but non-zero predictive power that isn't related to stats. I've included it in my regression, though it doesn't actually change my top three list. It does, however, make me suspicious. There are two possible explanations for this:
Current answer:
My current top candidate is #11 (stats of 7-4-7-10-10-7). If they should Refuse The Call, my current second place is #19, (5-2-5-10-9-10, also supported by Amy), and my current third place is #7 (10-2-9-7-9-6).
I'll tweak the regression a bit and see if anything changes, but #11 is very far ahead of the pack, with the highest stat total and a skew towards the D/E/F stats that are more valuable, so I don't expect them to stop being at the top.
A, B and C (the three stats that Bella/Liboulen/Linestra care about) are all slightly positively correlated with one another. D, E and F (the three stats that Fizz/Ister/Ziqual care about) are again all slightly positively correlated with one another.
However, each of A-C is slightly negatively correlated with each of D-F. This is true in the candidate data, it's not an artefact of how the fairies choose.
My current theory is that e.g. A-C are Physical stats, and D-F are Mental stats (or vice versa), and that these are correlated between potential heroes. This also suggests some faerie politics, with the Physical Stats Caucus and the Mental Stats Caucus pushing for different types of hero.
Most stats seem straightforwardly beneficial to increase. D-F seem slightly more valuable than A-C.
Given that Fizz/Ziqual sound like male names, while Bella/Linestra sound like female names, and our faerie is female, she's more likely to be in the A-C Caucus than in the D-F caucus: don't tell her that D-F are more valuable until you figure out her name.
In particular, it looks like A-C have diminishing returns while D-F have increasing returns. Increasing A from 9 to 10 actually might be actively bad. Increasing B/C from 9 to 10 is good, but nowhere near as good as increasing them from 1 to 2. On the other hand, increasing D-F seems to get even better as they get higher (though E in particular looks a bit odd).
Still to do:
Fizz, Ister and Ziqual appear to be driven by three different variables: let's call them D, E and F (Doubt, Envy and Fear?).
We now have six variables, which makes me suspect that actually these are meant to be STR/DEX/CON/INT/WIS/CHA in some order. I can't reconstruct which order, though. (Though if five of them seem valuable and one seems useless I am going to be open to the possibility that this is the same winrate calc as in the original D&D.Sci).
The obvious next step is going to be taking the success/failure data and evaluating it based on these six derived variables. Back soon...
Amy's score is always 1 or 99, and is completely independent of all other scores, and seems almost uncorrelated with success. She might just be flipping a coin, but she only gives 99 about 1/4 of the time. Flipping two coins?
Holly's score is moderately-well-correlated with all other scores except Amy's. I suspect her of knowing Amy is flipping a coin, and of just averaging out all the other faeries' scores to get her own, but I have no proof yet.
Bella, Colleen, Liboulen and Linestra's scores all heavily correlate with one another. Starting to disentangle them:
Fizz, Ister and Ziqual again all correlate with one another. I haven't dug into them yet.
Are you sure that saying 'without searching' actually makes it not search?
Suppose I tell you that you have a nice house, and it would be a shame if anything happened to it.
What do I mean?
So this boils down to interpreting scatter charts.
Say you plot two normally-distributed numbers against one another. You get something that looks like this:
If instead you plot two d6 rolls against one another, you see this:
with sharp cutoffs because the d6 roll is bounded at 1 above and 6 below, and with a regular grid because the d6 roll is always an integer.
Various relationships between the variables can show up in the scatter chart
If Y is the sum of two d6 rolls, and X is the first roll, you see this:
You can think of this graph as being made up of various stripes:
The vertical green line is 'every value the second die can roll, given that the first die rolled a 2'.
The diagonal orange line is 'every value the first die can roll, given that the second die rolled a 4'.
Suppose that X = twice the first die plus the second die, and Y = twice the second die plus the first die:
Again the points form a grid, and again we can see patterns. Since the green line has 6 points on it and moves [up 2 and right 1] each step, we can see something that takes 6 discrete values and applies 2x its value to Y and 1x its value to X.
Now plot Bella's scores against Liboulen's:
This is a bit more complicated because there are three variables rather than two. But you can still imagine the same lines:
and you can disentangle the corresponding variables.