Love me some Johnny Cueto day.
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Love me some Johnny Cueto day.
If it's so simple a child can understand it, I'm not sure why you're unable to grasp there's no difference in accuracy. They're on a different scale but they're proportionately the same. They achieve the exact same thing except one is scaled to sort in A-Z and the other Z-A.
Say league ERA is 4.00 for math's sake. You have four players:
2.00
3.00
5.00
6.00
Their ERA- are respectively:
50
75
125
150
And their ERA+ are
200
133
80
67
Now run correlation and you'll find they correlate exactly the same except in inverse of one another. The order doesn't change. They are still 'ranked' exactly the same way, but inverse. No matter which one you use, their ranking 1, 2, 3 & 4 is EXACTLY the same but in reverse. Thus, there is literally no difference in "accuracy."
Math, dude. Math.