Count Formula for a Distinct Count Column?

HI! I am trying to arrive at a count, per each group header break down within my report, of all entries within a distinct count column that are greater than 1. A distinct count column of entries is not included in the listing of items that are available via the Summary icon. I then try via the formula function, but am having trouble creating the formula for this particular function, though. Any suggestions?

Thank you!

Eric K.