Counting Unique "Items"

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gdseric

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Need help! I have struggled with this for two days! I know it's right in front of me, but...

If I wanted to count the unique occurrences of items in a range (in Excel, obviously), how do I do it? For example, I have 516 rows of data in a worksheet (all participant/student activity related)...approximately 120 different students comprising 516 different activities. I can count the number of activities, no sweat, and can even categorize them by activity code, but how do I count the number of unique participants (with unique social security numbers) in the worksheet? 516 social security numbers in a list, but only about 120 students.

I am trying hard not to breach confidentiality, hence the vague question!

Thanks in advance...
 

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On 2002-09-18 11:35, gdseric wrote:
Need help! I have struggled with this for two days! I know it's right in front of me, but...

If I wanted to count the unique occurrences of items in a range (in Excel, obviously), how do I do it? For example, I have 516 rows of data in a worksheet (all participant/student activity related)...approximately 120 different students comprising 516 different activities. I can count the number of activities, no sweat, and can even categorize them by activity code, but how do I count the number of unique participants (with unique social security numbers) in the worksheet? 516 social security numbers in a list, but only about 120 students.

I am trying hard not to breach confidentiality, hence the vague question!

Thanks in advance...
Click to expand...

Let A2:A520 house the SSNs.

Use one of:

=SUM(IF(LEN(A2:A520),1/COUNTIF(A2:A520,A2:A520)))

which you need to array enter using control+shift+enter (not just enter).

=COUNTDIFF(A2:A520)

which you enter normally.

COUNTDIFF is part of morefunc.xll, an add-in that you can download from:

http://longre.free.fr/english/index.html
 
Upvote 0
That did it, Aladin! I knew it was something simple. Thanks for the referral on the add-in. Didn't have that one! Eric
 
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