I've been reading this thread on David Wright. It made me wonder what the proper weights are for projecting a player, varied by the component. I looked at strikeout rate, walk rate, homer rate, and BA on balls in play. The hitters I used are guys who had 400+ AB in 4 straight years from 1982 to 2005. I'm using the first 3 years to try and project year 5. The weights are year-1, year-2, year-3, and LG average.
For K, the weights I get are 7/3/2/1, which yields a new .235 K rate for Wright.
BB: 9/5/4/1. Not a whole lot of regression needed when you have 3 full years of these players. Wright comes in at .133 per PA, the only part of his game where he's playing at his normal level.
HR: 11/7/5/2. For David, a .043 rate per contact (AB-K) which means 12 more homers, and a projected season total of only 16.
BABIP: 10/7/6/10. Here's where regression plays a big role, but still gives a rest of season figure of .368. We can do a better job by considering batted ball data and player speed, but that's it for tonight.
I didn't do extrabase hits, but assume 20 2b and 3 3b, put the pieces together, and I get a rest of season line of 303/395/475. That does surprise me a bit, I didn't think his power projection would drop so much. But he's still a great player, even if that's all he does from here on out.