Talk:Ashe/@comment-31728880-20170412234027/@comment-3391671-20170413004315

Base stats in League work on a "growth" system. The growth system is an exponential system where stats do not grow at a flat rate over the levels, instead being small early on, but greater in the late game. It initially did work on flat growth, but the new system has been applied for the while.

The stats you see about with the +, in this case being 79, is the base growth per level. The median growth. By level 18, the growth per level is 79. However, growth is less than 79 before level 9, 10 while growth is greater than 79 after 9, 10.

This system was (likely) implemented so that stat gains later on do not become less significant than early on. If it was flat, Ashe's gain in base health onto lvl2 would be around 15%, while at lvl18, that last gain is worth around 4%. With the growth system, the gain per level is smoothened so that percentile-wise, it is rounded out a bit more, thus making gained health per level a bit more significant later on and less impactful early on. Respectively, lvl2 would be around 11% (+57) while by lvl18, it is closer to 6% (+101).

Apologies for the wall of text, but hopefully this explains why it is not linear, and the reasoning for it.