A great deal of my work with clients is SPC, statistical process control. In Excel with or without Powerpivot (depending on the data size) I create a column with the process data which is usually data over fixed time period (Patients per week, Appointments per day etc) then overlay control limits (upper and lower UCL+LCL, based on 3*stdevP) along with Average and Erlang's (0.8*(UCL-LCL)+LCL with all 5 lines displayed on the graph and the extracted numbers in a box at the side. (LCL,UCL+Average+Erlangs). It would be awesome to have it as a type of chart instead of calculating it all out manually each time (even with Macros it's a pain)