Use the filtervalues function. Patterncount is sometimes used but it can produce incorrect results with some combinations of values.
If [ Not IsEmpty ( Filtervalues ( table::fieldName ; "value A" ) ) ]
in place of Not IsEmpty, you can also use ValueCount to get the same results.
Outstanding! I've already tried that bit'o'code out, and it seems to do exactly what I'm looking for.
Thank you very much!