I'm looking to create a 3D scatterplot for a data structure like this:
            Criteria 1  Criteria 2  Criteria 3
Criteria 4  a           b           x,y
Criteria 5  a           b           x,y
where a, b, and x, y are seperate data points. 
Note that x, y = 2 different data points.
How can I do this?
 
    