I am using Discoverer to pull a data set over series of time then
calulation the series in with a calculation

(Data(at point 0)- Data(at day (variable)))/(Data(0)- Data(point
varies depending on tab))

The second terms refers to collums, the report measure build remain
over a period of time. The periods are specified by what tab you are
on, Say 30 days or 90 days. Is there a way to peg the last term
[Data(point varies depending on tab)] to a parameter? The second
question, in association with the paramater choices the denominator
could that parameter also choice how many collumns are shown in the
report rather than having unused collumns show an error message?


Thanks in advnace,
Paul