Thanks Alex! Honestly I’m not sure what you’re missing. I just plugged LeBron’s full season 2012-13 numbers into the above formula and got a result of +8.32. Maybe you’re subtracting free throw attempts instead of adding them?
Also be aware that I’ve since updated the RSPM formula. The updated formula can be found here: https://youhavenogame.wordpress.com/2013/04/21/updated-rspm-formula/

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