The other thing we can do, a thing which some folks think is of questionable value, is that we can can average the disparate WAR(P) values into a single number. This number, which I call WAR Index (WARi), I believe is valuable in that it gives a snapshot of the entire existing saber community’s look at a single player’s season or career. While many people neck-deep in objective analysis prefer one form of WAR(P) or another, many casual fans or people new to sabermetrics may just use whatever they are presented with.
...One last thing that I need to bring up is that calculating a player’s adjusted WARs and WAR Index over a career is kind of a painful process. Why? Because, unfortunately, the adjustments per plate appearances vary from season to season. The adjustment from fWAR to rWAR may be exactly the same for 2012 and 2011 right now, but it is different for 2010, and almost every single year prior that I’ve looked at. And while WARP may be a smaller total amount for hitters than rWAR for 2012 and 2011, that wasn’t always the case. The total WARP for hitters in 2010 was actually more than total rWAR, so a different adjustment needs to be made. So it’s a labor-intensive, but somewhat rewarding process to do this over several years, as each year has (two) different adjustments that need to be used to calculate WARi. It can take some time.
Nevertheless, with these adjustments, we finally have a (sort of) equal baseline that we can use to (1) average these three replacement-level measures together and (2) determine which systems have the biggest deltas, or differences between the systems. While it’s not a perfect system, it works for what I’m trying to do, which to identify major differences in valuation, and to start to build an overview of how these three systems jointly value a player.
Excited? At least moderately intrigued? I hope so. Later today, I’ll share the qualified hitters for 2012, and show you how they stack up in terms of WAR Index, and where the biggest differences in valuation come from between the WAR systems. Stick around!
Posted: October 10, 2012 at 08:42 AM | 31 comment(s)
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