I just finished reading a pretty nice piece from Wahoo Blues author Lewie Pollis. He wrote a nice piece entitled A Better Way to Measure Power Basically, it’s a more pure version of Isolated Power (ISO) that takes BABIP fluctuations out of the equation. I like it after viewing this:
Iso Ranking Chart
Power Factor Ranking Chart
The calculation is relatively easy as it’s just:
POWER FACTOR = ISO/BATTING AVERAGE
Doing this quick calculation yields this ranking sheet:
I don’t think too many fans would disagree with this ranking, though I’m a bit shocked that Dan Johnson graded out that strongly. Boy’s got some power to him for sure.
Just wanted to share this real quick as I think R^2 values demonstrated in Mr. Pollis’s article speak for themselves as far as the predictive power of this tool. As always, remember what we’re looking at. This is strictly a measure of power and should be used in conjunction with other more well-rounded statistics like wOBA.