2009 Open Statistical Analysis Question Thread

EDIT(11:20AM): For anyone new to LL or advanced analysis, this is the perfect time to ask any question, no matter how basic. I can't stress this strongly enough.

We've discussed some more advanced nuts&bolts-type stuff in the comments, but even if you have a question like "what are tRA and wOBA and why do you use them instead of OPS and FIP," ask ask ask!

We had one of these last year, and it seemed to work out pretty well to get people's questions, however basic answered.

I think it would be a good idea to do this again this year, esepcially with the influx of new posters to Lookout Landing, it would be nice to have a place where you can ask any advanced analysis question and have it answered by someone with great knowledge of this area.

Jeff, Matthew, and Graham have been great at answering questions, and another thing I'm hoping will happen here is that other knowledgeable non-mod posters will be able to contribute and help out as well. I know that at least for me personally, I've learned a ton just in the last year, to the point where I'd be comfortable fielding at least basic questions regarding advanced analysis and metrics.

So feel free to ask any question and we'll do our best to answer them. I'd ask that the regulars really take it easy on everyone in this thread and just do your best to help the asker understand, no matter how basic the query.

Of course this doesn't mean that I don't have my own questions that I'd like to have answered, and honestly, part of this thread was me being selfish enough to make a FanPost hoping to get a few answers out of everyone.

- How does pitching tRA convert to runs above/below average? Is it just a simple [(tRAplayer-tRAleague)*xO]/27?

- What's the definition of replacement-level for a pitcher? For a hitter, we know it's ~20 runs per 600 PA or like .033 runs/PA. Is there a similar sliding scale for pitchers? Is it different for relievers/starters? And what would be that number, if there is one.

- It's my understanding that positional adjustments are defined so that an average hitter at a position in relation to his peers who is exactly an average fielder will always be worth 2 WAR. Why do we value positions like C and SS over corner OF and 1B? Shouldn't a 2 WAR player be a 2 WAR player, regardless of position? I understand scarcity, but due to positional adjustment, shouldn't a 2 WAR catcher be just as available as a 2 WAR LF?

- How does positional adjustment work if a guy plays a lot of positions? Does he just get each positional adjustment multiplied by percentage of playing time at a given spot?

- Are positional adjustments based on ~600 PA? Do you get a bigger adjustment if you play, say CF, and get 700 PAs in a season?

Also, when this is all said and done, I'll try to compile the answers and post them in a new FanPost so we'll have a lot of good information stuck in one spot.

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