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Showing posts from February, 2026

Revisiting Guillen Number: Percentage of Runs Scored Via Home Run

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     Baseball Prospectus used to track a metric called Guillen Number, which was defined as “the percentage of a team’s runs which come via home runs.” It’s always been an interesting number to me, especially as a fan of the Yankees, a team that consistently is near the top in that percentage, and as a fan who has observed the shift in the game becoming more home run focused in general. I like this metric because it describes exactly what it describes: how often are teams scoring from home runs. It doesn’t describe how many runs that team scores or how good that offense is, but it gives implications that fans care about. Are teams with high Guillen scores reliant on home runs to score? Is it a bad thing to have a high Guillen number?      My main motivation for revisiting this metric is because it’s hard to find. I don’t believe Baseball Prospectus tracks it anymore, and easy access websites like Baseball Reference and Fangraphs would require a lot of cli...