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Power-speed Number - PSN

What is Power-speed Number - PSN?

A statistic in baseball created by Bill James which combines a players home run and stolen base production into a single number. 

It is calculated as follows:

(2 x Home Runs x Stolen Bases) / (Home Runs + Stolen Bases)

Sporting Charts explains Power-speed Number - PSN

Bill James created this statistic with the goal of quantifying the various home-run/stolen bases clubs often quoted in baseball such as the 30/30 and 40/40 clubs. The highest single-season Power-speed Number recorded was by Alex Rodriguez during the 1998 season when he put up a 43.9 PSN.  

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