I have long database of our dealer network and I like to grade them. The
methodology I like to use is to create a normal distrubition curve and
eliminate the worst performing (leftmost part of the curve) 10% in any given
area. Then I like to graph the market and show the boss how we graded the
channel. I assume one of the functions coming with the "data-analysis" Add-in
should do this but I could not figure out how.