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I actually made a spreadsheet in Excel that does ratings-stats conversions for pitchers (and hitters) about a year ago, though there is one tricky bit (Control influences HR rate, and Control and Movement influence K rate) that I never bothered to make perfect. I could dig it off a backup drive and post it at some point if it's of any interest. If you can find them, there are a few threads from a year or two ago where we hashed out all of the relevant formulas, if I recall correctly.
The Design Team actually proposed that this kind of ratings calculator be integrated in OOTP-9, and we wrote up a spec for it, but I think other features took priority. Wouldn't be surprised to see it built into v10, though I have no inside knowledge there.
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