Using INDEX to filter top N values within a category [Video]
This video is the third in a series of videos which aim to explain the use of the index() function in Tableau – specifically for using it to provide a rank of data points.
If you are new to the subject, and have not yet watched the previous videos, I suggest you watch these first:
the following posts are also relevant
In this video, we demonstrate how to make use of the INDEX function to create a rank which provide a TOP N filter within a category