I am trying to create a line graph that follows the productivity of a group of practitioners, every two weeks, over a specified timeline. My report has grouping by program, year, and two week periods. I have a formula that looks at the productivity percent within that 2 week period. I would like a report that takes that percent and graphs it over what ever period specified as a report parameter. I would like my report to use the two week "End date" as the "On Change of" value and the "Show Value" should be the Productivity Percent. Problem is you can not use a formula as a data field. Is there a way to get a formula value as a graph parameter?