I don't feel like studying for my final today, so I went and looked up his hit locations for 1992 through 1998. I used BR and they have the stats for balls pulled, hit up the middle, and to the opposite field, as well as "Unknown Loc." I ignored the last one and just used the first three. I used the ABs for each of the three classifications, assuming that means a ball was put in play in that direction, and for each location, took the ratio of ABs in that direction to total ABs in all three directions (again ignoring the unknown location). This is the top plot. I then calculated his BA in the three directions. This is the bottom plot. I also plotted his overall BA for the season.
http://s23.postimg.org/a74zhbj57/Olerud.jpg