This is our proprietary skill rating calculation. This has nothing to do with official game ranking or MMR.
The purpose is to show player skill levels relative to other players, not estimate MMR.
AURA - Ally lane minions within 70 units gain 25% Health and Attack Speed. Whenever an ally lane minion dies within 70 units of you, gain 5 power per stack, max 6 stacks for 15 seconds.