Originally Posted by RedsManRick
The 2:1 ratio is interesting, but I'm not sure what he would have us do with it. The real trick comes in figuring out how you acquire each. How much does a run prevented cost compared to a run scored? If you find out that a run prevented only costs $200k and a run scored costs $500k, that's something you can make decisions with.
Without taking a position on whether that 50% is accurate, I'd argue the ratio -- be it Dewan's or anyone else's -- is a keystone to plenty of other numbers.
You can't value a position player without expressly or implicitly attaching a run value (plus or minus) to his defensive value. And you can't do that without figuring out his defensive ability relative to his positional peers AND staking out a position on how much defense is worth in the first place. Without a solid working answer to the second question, it's all just guessing.