Category: Sports

Today we move onto one of the gems of advanced baseball statistics¹Somehow I’ve gone this long without using the phrase Sabermetrics, which is the catch-all term for many of the derived values we’ve been covering. Its name comes from SABR, the Society for American Baseball Research. that generalizes player value beyond concrete elements like hits and runs, and looks specifically at how many wins a player is worth.

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  Somehow I’ve gone this long without using the phrase Sabermetrics, which is the catch-all term for many of the derived values we’ve been covering. Its name comes from SABR, the Society for American Baseball Research.

Let’s dive back into the weeds. Hitting the ball and getting on base are important jobs for hitters. But what actually wins the game? Scoring more runs than the other team. Today, we’ll look at two ways of quantifying run production, both of which are weighted in the same way we saw with wOBA.

Today we’ll look at a statistic that is interesting for both the offensive and defensive side of baseball. When a ball is put in play, how often does it go for a hit?

In another day of simpler statistics, Isolated Power (ISO) is derived from slugging percentage. It’s calculated in the exact same way, but ignores singles. Hence, it is isolating the power of a hitter, defined as the rate at which they get extra-base hits.

Let’s take a step back today and consider an overall shift in the way baseball has been played over the last few decades.

You may have recognized that OBP and SLG each measure slightly different things. OBP is only a measure of whether you got on base, while SLG makes a big fuss over your hits in particular, and how “big” they were. OPS (and even better, OPS+) are a quick summary of these combined, which is cool. However, OPS treats OBP and SLG as essentially equal in their importance, while getting on base is demonstrably of higher value. If you want a more accurate measure of offensive production that is (relatively) simple to calculate, look no further than weighted on base average, or wOBA.

BA, OBP, and SLG make up what is typically known as the triple slash line for hitting. You’ll often see something written like .275/.310/.382. That is BA, OBP, and SLG in order. However, we do like our summary statistics that reduce how many numbers we need to compare for making quick calls, so we use OPS: On Base plus Slugging.