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I originally came up with this statistic to measure the play of NBA point guards, but I modified the formula here to apply to collegiate players and be understood more easily.
Here's my original explanation of the stat, which is intended to measure success at manufacturing points.
Hopefully you've made it all the way through that explanation so I can explain how mPlayRtg+ is different. This is the easy part, since there are only two major differences.
No. 1: This is how we get the "m" in front of the PlayRtg+. Because usage rate stats are not available for just the tournament games, I used minutes played per game instead. This accomplishes the same purpose, although a little bit of accuracy is lost, since it measures time on the court and not involvement while on the court.
No. 2: This is how we get the "+" after mPlayRtg. Instead of leaving the numbers in their raw forms, as I did with the original stat, I've calculated an average based on all tournaments in the game and modified the numbers to show them in relation to that average.
A 100 mPlayRtg+ means that the player was perfectly in line with the tournament average raw score of 26.94, while a 200 mPlayRtg+ would indicate a score of 53.88, twice as good as the average. Similarly, a 13.47 would indicate that the playmaking was only half as good as the tournament average.