Although you do not have the actual Nine$-$box ratings for each employee in your data, you can get a

good idea of the top performers by ranking employees by average $($non$-$self$)$ ratings and creating

groups of employees based on those rankings.

$$ Prepare a visualization that ranks the employees by average non$-$self$-$rating from highest to

lowest.

$$ Assign each employee to a rankings group $($top$,$ middle, bottom$)$ based one whether their

rankings fall in the top, middle or bottom third of the rankings