[chrispedersen]

Well, from the manual, p 51: suggests that eatch hot or cold decreases tax by 5% and supplies by 10%.

I think there is more scatter in the data, than you can accomodate.

Income is affected by type of fortress:
Kelp Cit = admin 40, at ma, oceania
Ramparts (Atlantis EA) = 15
Fortified City (Atlantis LA) =50
Dark cit =20 Ryallah

Basic Form = Pop/100 * Scale modifiers)* 1+fort/200, presuming no unrest.
I don't know your methodologies, but
if you had all neutral scales,


Case 1
Oceania Should be 338, without a hit for cold scales. And it is.
Ryalla Should be 326.7 Close enough.
Atlantis If early age, should be 318. If MA should be 354.
Actual is 324. so either +.5% or -8%.

Case 2:
Oceania, should be 457 Actual is 447. about -2%
R'lyeh , should be 424. Actual 434
Atlantis should be 456 Actual 485. about +6%


So, I don't think you can draw any conclusions. In the first case, oceania clearly did not take a hit from -3 cold. But no one took the expected 15% hit.