CountIF based on unique values

[wangaa11]

Hello, I am trying to count the number of times "positive" occurs however the positive could occur duplicate times for a unique value and I only want to count the positive the one time in that instance.



For example and I would attach an actual example but it for whatever reason isn't working so I hope this will do.

H235 Negative
HA260 Negative
H235 Positive
H789 Positive
HA852 Negative
HA951 Negative
HA951 Negative
HA951 Positive
H235 Positive

I should only have 3 "positives" as H235 & HA951 has a duplicate positive

I should note there are over hundreds of rows of data which has a number of unique H values in that first "column" Any assistance on this is greatly appreciated

 

[Fluff]

How about

+Fluff v2.xlsm
	A	B	C	D
1
2	H235	Negative		3
3	HA260	Negative
4	H235	Positive
5	H789	Positive
6	HA852	Negative
7	HA951	Negative
8	HA951	Negative
9	HA951	Positive
10	H235	Positive
11
Master

Cell Formulas
Range	Formula
D2	D2	=SUM(--(FREQUENCY(IF(B2:B10="Positive",MATCH(A2:A10,A2:A10,0)),ROW(A2:A10)-ROW(A2)+1)>0))
Press CTRL+SHIFT+ENTER to enter array formulas.

 

[wangaa11]

How about

+Fluff v2.xlsm
	A	B	C	D
1
2	H235	Negative		3
3	HA260	Negative
4	H235	Positive
5	H789	Positive
6	HA852	Negative
7	HA951	Negative
8	HA951	Negative
9	HA951	Positive
10	H235	Positive
11
Master

Cell Formulas
Range	Formula
D2	D2	=SUM(--(FREQUENCY(IF(B2:B10="Positive",MATCH(A2:A10,A2:A10,0)),ROW(A2:A10)-ROW(A2)+1)>0))
Press CTRL+SHIFT+ENTER to enter array formulas.

thank you for the help however I am still getting a value error and I even used the sample that you provided with the exact same setup and I am getting an error

 

[wangaa11]

How about

+Fluff v2.xlsm
	A	B	C	D
1
2	H235	Negative		3
3	HA260	Negative
4	H235	Positive
5	H789	Positive
6	HA852	Negative
7	HA951	Negative
8	HA951	Negative
9	HA951	Positive
10	H235	Positive
11
Master

Cell Formulas
Range	Formula
D2	D2	=SUM(--(FREQUENCY(IF(B2:B10="Positive",MATCH(A2:A10,A2:A10,0)),ROW(A2:A10)-ROW(A2)+1)>0))
Press CTRL+SHIFT+ENTER to enter array formulas.

However what is interesting is if I move the formula down to D4 I get a 1?

 

[Fluff]

What error are you getting?
Also did you confirm the formula with Ctrl Shift Enter?

 

[wangaa11]

What error are you getting?
Also did you confirm the formula with Ctrl Shift Enter?

I am getting a #Value! error.

It worked. I did ctrl shift enter incorrectly. It is working now thank you.

 

[Fluff]

You're welcome & thanks for the feedback.

 

[Fluff]

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CountIf but have duplicate values [SOLVED]

Hello, I am trying to count the number of times "positive" occurs however the positive could occur duplicate times for a unique value and I only want to count the positive the one time in that instance. For example and I would attach an actual example but it for whatever reason isnt...

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