Hi I am trying to count all records that fall between the ages of 14 - 18.
The ID numbers relating to each record may appear more than once on a long list so I need to count each ID only once.
Example attached.
EG an ID (relating to a person) may appear 3 times in a list of 200. I want to count them if they are between age 14 and 18 but I only want to count them once, not three times.
Thanks - example attached
Not quite sure if what your objective is and where you want it, but what about modifying your formula on E6 and dragged down works:
=IF(AND(C6>=$G$1,C6<=$G$2,COUNTIF($A$6:$A6,A6)=1),1,0)
Ron
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Single array formula alternative:
and
=COUNT(1/FREQUENCY(IF(C$6:C$96>=$G$1,IF(C$6:C$96<=$G$2,IF($A$6:$A$96<>"",MATCH($A$6:$A$96,$A$6:$A$96,0)))),ROW($A$6:$A$96)-ROW($A$6)+1))
both confirmed with CTRL+SHIFT+ENTER not just ENTER=COUNT(1/FREQUENCY(IF(D$6:D$96>=$G$1,IF(D$6:D$96<=$G$2,IF($A$6:$A$96<>"",MATCH($A$6:$A$96,$A$6:$A$96,0)))),ROW($A$6:$A$96)-ROW($A$6)+1))
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