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Default Need help with formula to weed out duplicates

Excel 2003
I receive information regarding patients in a hospital setting, the patient
being
identified by Medical Record Number.
I need to know the number of pts on ventilators in a month, then the
compliance
to several different tasks/processes performed on those patients per month.
(# of yes answers divided by the total number of pts) The problem is that a
lot of the data received is on the same pt, repeated on different days.
I have a formula to disregard the duplicate med rec numbers:
=sumproduct((range<"")/countif(range,range&""))
this works fine to count the number of patients for the month without
counting duplicates.
How can I count the number of yes/no answers in other columns without
counting the duplicates? I don't know how to put that together successfully.
thanks, Meenie

 
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