They are all defined in the common\unit folder. If you create a new technology groups, you'll have to create military units dedicated to this groups. until the tech level indicated, countries of this technology groups will have some reduced costs in their research. Eastern countries can have 60% of cavalry, which mean 40% of infantry is needed to escape the penalty.
cav_to_inf_ratio indicate the maximum percentage of cavalry (in men, not in regiments) you can have in an army, without counting artillery units, before having the cavalry penalty. At later date the game will calculate the start level according to it and to techs modifier. At the earliest game start defined in the defines.txt, all countries will start at the start_level value in all fields of research. 
With a modifier under 0.2, countries will not be able to build cavalry regiment or fleets. Modifiers also have two others side effects : with a modifier under 0.5 AI of countries will not try to colonize empty provinces. Technology cost also depend of values indicated in the technology table file.
Western technology groups have a modifier of 1 which mean that each point of research will cost 1 ducat while the new world technology groups who have a modifier of 0.1 will need to invest 10 ducats for each research point.
The modifier indicate how much will cost the technological investments. The file can have any name you want, but it is best to use the research field name to avoid confusion. The path to the file is relative to the common folder. This defines the trade research field, and links it to the definition found in the file listed. The file include the fields of research at the bottom inside the table bracket. What group each country belongs to at the beginning of each game is defined in the country files in the history folder. I try to keep the scoring algorithm more or less up to date, so assuming I didn't miss any important changes, here's the 1.30 latest ranking.Įverything in this post is about single player only, multiplayer meta is drastically different.The effects as described below are contained in the technology.txt file in the common folder. Not to mention original algorithm had some minor issues. This was 5 years ago, patches completely changing game balance happened, so those specific values are outdated. 
I once created an algorithm to rank all EU4 idea groups. Power level is relatively easy to analyze objectively. There are two sides of this badness - power level and identity.
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