ISO
Isolated Power -- a measure of raw power, calculated as slugging percentage minus batting average, showing extra-base hit frequency.
Like measuring a car's horsepower separately from its fuel efficiency -- both matter, but they measure different things.
Why it matters
ISO tells you how often a hitter does damage beyond singles. High ISO means more doubles, triples, and home runs.
How DMP uses this
DMP uses ISO to evaluate power upside for total bases, home run, and RBI prop projections.
Common mistake
Conflating high batting average with power -- a .300 hitter with .100 ISO has no pop.