Thanks for the attention! The solution you gave me seems to work for regular columns, but not for columns created through the use of a Claygent . I tried alternatively to change the output to "Yes", "No", or "Unknown", as my choice of numeric output was actually more coming from a background where I would code something to analize a csv file. Anyway, my natural outputs are yes, no and unknown and I changed the column to reflect that - but it still doesn't work with the filters. It is as if the filters didn't have access to the outputs of a Claygent-created column.