After looking at batting average and its flaws last week, I decided next to focus on reforming slugging percentage.
Slugging percentage is considered to be one of the most important stats for evaluating a player at the plate, as it supposedly measures the quality of a batter's hits. I find however, that it fails in doing such in the optimal way, but that the idea is certainly valuable.
For reference, here is the equation for slugging "percentage."
This stat of course has many flaws, which I will kindly list below.
- ABs in the denominator. Let's just stop looking at that stat entirely.
- It weights the different hits incorrectly. We know this obviously, as the work involving wOBA and wRC+ has advanced offensive statistics way past this point. A home run is not 4 times as valuable as a single, a triple is not 3 times as valuable, etc.
- It isn't a percentage.