FIRST() and LAST() may be your answer based off the information that you gave. You should be able to throw whatever calculated field you create from this into your Filter Card and create whichever type of graph you please.
Hi Martin, thanks for replying.
I have it already working using first/last in a table view but it requires the rank column to be present in the table. I.e The ranks are visible as columns and so first last works as intended. I need to be be able to take this group of (lets say first 10) and make a bar chart of various other characteristics they have (i.e like country).