You shouldn't alter SLG% or anything else to account for stolen bases. A single and a stolen base is not the same as a double. A double advances runners 2, and sometimes 3 bases. A single advances them one, and sometimes 2. And if you're going to count a single and a stolen base as doubles, you absolutely must take the caught stealing's off of the OBP. And the batting average. And the SLG%. Because every out on the basepaths he makes would take away from each of those categories, if that's how you want to count it. Leaving Pierre's 2006 line looking like this...... .263/.303/.422 That's still a mighty ugly line. So the 20 times he got caught stealing essentially lowers his practical OBP to .303. Sabremetrically speaking, stolen bases are a grossly overrated stat. Over the years, the best formulas show that every 7 stolen bases creates one run that *otherwise would not have score*. Not every stolen base results in the runner scoring, and not every stolen base results in a run that wouldn't have come in anyways. Conversely, every 4 times you are caught stealing, you cost your team one run that otherwise would have scored. Meaning that Pierre's 58 steals created approximately 8.5 runs, and his 20 caught cost his team 5 runs, for a whopping net gain of 3.5 runs. Playing the sabre game, that's less than half a win for an entire season. And many have argued that a base stealer on base is detrimental to the batter. That's neither here nor there, as it's tough to argue one way or the other. But what's not tough to argue is the value of a base stealer. Historically speaking, teams that steal a lot don't score more runs than teams that don't, unless they just don't ever get caught stealing. Yes, situationally speaking it's nice to have a guy that can steal a base in a tight game. But it's not so nice that it can be used to justify a leadoff guy who carries a sub .330 OBP. I'd rather have a guy like Brady Clark leading off (and never stealing) than a guy like Juan Pierre, and that's really not saying much.