Each Thursday we will be covering different statistics that have very strong uses for fantasy. They are not stats that get used for ranking, but they can greatly affect your team. Some we already use on this site, and others we will discuss if they can be used for our analysis.
ISO (Isolated Power)
ISO is a calculation that gives the ability of a player to get extra bases on hits. This may sound similar to SLG, but there is a difference you can use to your advantage. If year to year a players SLG stays the same, he could be adding extra singles but losing power as he hits less homers. Let's take a look at several different calculations used for ISO:
ISO = (2B*(3B*2))+(HR*3))/AB
Sometimes ISO is given in the simple calculation of:
ISO = SLG%-AVG
Also if you look at PECOTA, they use this:
ISO = (2B + 3B = (HR*3))/AB
The last one is very interesting because it removes extra value from triples as they are mostly a result of speed and not power.
SEC (Secondary Average)
SEC is a calculation that takes into account how many bases a player can add through power, walks and speed. It expands ISO to include their ability to get on base and steal extra bases. The calculation is as follows:
SEC = (TB-H+BB+SB-CS)/AB
What can we learn?
So what do we need out of these numbers? ISO is much more commonly used in fantasy to show a gain or loss of power. I think SEC should start to gain more influence as it takes into account the two most important offensive categories; HR and SB. Rankings by SEC gives you a much more representative view of power vs speed when comparing players.
Both stats have their uses, but if I had to pick one, I would use SEC to get the best talent. If you need the best power, you should look at ISO, but if you need speed, you can skip straight to steals and speed scores.
I do like confirming power growth with hittracker data, but these numbers are a strong comparison.
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