Love me some Johnny Cueto day.
Love me some Johnny Cueto day.
Baseball is like church. Many attend, few understand
There's no difference in accuracy, they're just inverted. It would be akin to .85 and -0.85 in correlation. They would each correlate the same since their proportions are consistent going both ways.Originally Posted by junkhead
ERA- is better (more accurate) than ERA+.
Take a 4.00 ERA league. A 3.00 ERA is a 133 ERA+ (4/3) and a 2.00 ERA is a 200 ERA+ (4/2). That’s just misleading.
In terms of ERA-, it’s 75 and 50, which is consistent.
One just sounds more sensible to use.
"No matter how good you are, you're going to lose one-third of your games. No matter how bad you are you're going to win one-third of your games. It's the other third that makes the difference." ~Tommy Lasorda
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.
Last edited by Brutus; 06-07-2014 at 02:20 AM.
"No matter how good you are, you're going to lose one-third of your games. No matter how bad you are you're going to win one-third of your games. It's the other third that makes the difference." ~Tommy Lasorda
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