Trying to count results of various skills a person may have and display those in a chart.  For a majority we mark them as having a qualification with a 'yes' if they don't have it the field is blank, so 'Count: non-empty' works just fine and gives the results as expected.  Some of the qualifications have different levels so if they don't have it the field is still blank.  If they have 'Skill1' it's either 'Yes' or if they have gone to the next level it is listed as 'Superseded' and then yes on 'Skill2'.  In charting this it gets confusing as it will display 12 of 'Skill1' and 5 'Skill2'.  Would like to be able to filter out the Superseded in the chart so don't have to create multiple views.