User blog comment:Willb32764/Health vs Armor/Magic Resist/@comment-6016076-20150710084448

I don't think this is correct. You need to account for base health and base resist. You also need to take into consideration the relative value of resist vs. health. For example, you can establish that mathematically a point of resist is worth more than a point of health. However, in practice, a point of resist will also cost you 7.5x more than it would for health. It seems like you have a 7.5 in your equations, but I'm not understanding your y-intercept.

The base values are important for the following scenario:

Say you have 1000 health and 50 armor. One point of health is valued at 1.5 effective health; one point of armor is valued at 10 effective health. Multiplied by 7.5x to account for gold cost, the point of health is actually 11.25 effective health and more valuable than armor.

At level 18, you might have 2000 health and 75 armor. One point of health is 1.75, multiplying out to 13.125; one point of armor is valued at 20 health. The armor is more worthwhile.

Finally, you would need to consider %Resist reductions. In the previous example, this would reduce the efficacy to 12.2, and health is again more valuable.

You have two variables at work with effective health as your output. That can't be modeled in 2 dimensions.