I have a shapefile that consists on census blocks with multiple attributes per block. I am trying to find a way to consolidate those attributes into a quantity and use this to map density of attributes. The issue is that these attributes are text, not numbers. For example, if I am trying to determine the density of telecom providers for one specific census block, I have 12-32 instances of that one block in my .dbf, each with a different NAME. How can I add those NAMES up and map only the total calculation?