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#1
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Counting independent items in a list
This formula is meant to count independent entries in A1:A20.
=ROUND(SUMPRODUCT(1/COUNTIF(A1:A20,A1:A20)),0) Can anyone make this better? I am not talking about using Absolute references, but ways to modify it so it works in every case. For instance, at first I had an empty cell in my range and the #DIV/0 error was returned. I don't fully understand the two negatives in front of some formulas, but I am wondering if that would work better, too? =ROUND(SUMPRODUCT(1/--COUNTIF(A1:A20,A1:A20)),0) Thanks for any help. -- Brad E. |
#2
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Counting independent items in a list
Hi,
here's an alternative that ignores blanks =SUMPRODUCT((A1:A20"")/COUNTIF(A1:A10,A1:A20&"")) the double unary (--) coerce true or false into one or zero but do nothing in your formula. -- Mike When competing hypotheses are otherwise equal, adopt the hypothesis that introduces the fewest assumptions while still sufficiently answering the question. "Brad E." wrote: This formula is meant to count independent entries in A1:A20. =ROUND(SUMPRODUCT(1/COUNTIF(A1:A20,A1:A20)),0) Can anyone make this better? I am not talking about using Absolute references, but ways to modify it so it works in every case. For instance, at first I had an empty cell in my range and the #DIV/0 error was returned. I don't fully understand the two negatives in front of some formulas, but I am wondering if that would work better, too? =ROUND(SUMPRODUCT(1/--COUNTIF(A1:A20,A1:A20)),0) Thanks for any help. -- Brad E. |
#3
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Counting independent items in a list
Hi,
I should have added there are other (better) ways to do this and Bernd P has a well presented web page on how it should be done http://www.sulprobil.com/html/count_unique.html -- Mike When competing hypotheses are otherwise equal, adopt the hypothesis that introduces the fewest assumptions while still sufficiently answering the question. "Brad E." wrote: This formula is meant to count independent entries in A1:A20. =ROUND(SUMPRODUCT(1/COUNTIF(A1:A20,A1:A20)),0) Can anyone make this better? I am not talking about using Absolute references, but ways to modify it so it works in every case. For instance, at first I had an empty cell in my range and the #DIV/0 error was returned. I don't fully understand the two negatives in front of some formulas, but I am wondering if that would work better, too? =ROUND(SUMPRODUCT(1/--COUNTIF(A1:A20,A1:A20)),0) Thanks for any help. -- Brad E. |
#4
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Counting independent items in a list
This is Bernd's webpage that i was looking for where he specifically comments
on the solution I gave you http://www.sulprobil.com/html/excel_don_ts.html -- Mike When competing hypotheses are otherwise equal, adopt the hypothesis that introduces the fewest assumptions while still sufficiently answering the question. "Brad E." wrote: This formula is meant to count independent entries in A1:A20. =ROUND(SUMPRODUCT(1/COUNTIF(A1:A20,A1:A20)),0) Can anyone make this better? I am not talking about using Absolute references, but ways to modify it so it works in every case. For instance, at first I had an empty cell in my range and the #DIV/0 error was returned. I don't fully understand the two negatives in front of some formulas, but I am wondering if that would work better, too? =ROUND(SUMPRODUCT(1/--COUNTIF(A1:A20,A1:A20)),0) Thanks for any help. -- Brad E. |
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