Excel extract unique objects from list - excel

Question

I have a large list of companies who collaborate with my company. My company is broken down into different research groups. A company might collaborate with a single research group multiple times on the list or with multiple research groups.
I would like to find out which companies only collaborate with a single research group. Example of data is below, you can see that company A only collaborates with group 1 but multiple times, but company B collabs with many groups. How can I count this?
Examples data:
Group Company
1 A
1 B
1 C
1 A
1 C
2 D
2 D
2 E
2 E
2 B
2 D
3 D
3 F
3 B
3 F
4 G
4 B
4 B
It would be a binary result, 1=company is unique to group, 0=company is not unique to group.
An extension to this (although not included in my question) would be, how many groups do companies collab with on average

Answer 1

There's a workaround for what you want to achieve. Following solution use couple of helper columns and at the end will give result whether company is unique to group or not and count of groups companies collaborate with.
Assuming your data Group and Company are in Column A and Column B respectively follow the following steps:
Step 1: Get unique combination of Group and Company
In Cell D2 enter the following formula and drag/copy down as required.
=IFERROR(INDEX($A$2:$A$19 & "," & $B$2:$B$19,MATCH(0,INDEX(COUNTIF($D$1:D1,$A$2:$A$19 & "," & $B$2:$B$19),0,0),0)),"")
Step 2: Get count of each combination in data
In Cell E2 enter the following formula and drag/copy down till the row where Column D display values.
=COUNTIFS($A$2:$A$19,LEFT(D2,(FIND(",",D2,1)-1)),$B$2:$B$19,MID(D2,FIND(",",D2)+1,256))
This formula will give the count of occurrence of each combination from Column D in your data. For example, Group 1 and Company A occurs two time in you data, Group 2 and Company D occurs 3 times in your data, and so on.
Step 3: Get list of unique companies from Column B
In Cell F2 enter the following formula and drag/copy down as required.
=IFERROR(INDEX($B$2:$B$14,MATCH(0,INDEX(COUNTIF($F$1:F1,$B$2:$B$14),0,0),0)),"")
Step 4: Get count of groups each company collaborate with
In Cell G2 enter the following formula and drag/copy down till the row where Column F display values.
=COUNT(IF(MID($D$2:$D$12,FIND(",",$D$2:$D$12)+1,256)=F2,$E$2:$E$12))
This is an array formula so commit it by pressing Ctrl+Shift+Enter
Step 5: Check whether company is unique to Group or not
In Cell H2 enter the following formula and drag/copy down till the row where Column G display values.
=IF(COUNT(IF(MID($D$2:$D$12,FIND(",",$D$2:$D$12)+1,256)=F2,$E$2:$E$12))=1,1,0)
Again, this is an array formula so commit it by pressing Ctrl+Shift+Enter
or instead use this formula =IF(G2=1,1,0)
EDIT : As per requirement mentioned in comment
In Cell J2 enter:
=IFERROR(INDEX($B$2:$B$19 & "," & $A$2:$A$19,MATCH(0,INDEX(COUNTIF($D$1:J1,$A$2:$A$19 & "," & $B$2:$B$19),0,0),0)),"")
In Cell K2 enter:
=COUNTIFS($A$2:$A$19,MID(J2,FIND(",",J2)+1,256),$B$2:$B$19,LEFT(J2,(FIND(",",J2,1)-1)))
In Cell L2 enter:
=IFERROR(INDEX($A$2:$A$19,MATCH(0,INDEX(COUNTIF($L$1:L1,$A$2:$A$19),0,0),0)),"")
In Cell M2 enter:
=COUNT(IF(VALUE(MID($J$2:$J$12,FIND(",",$J$2:$J$12)+1,256))=L2,$E$2:$E$12))
This is an array formula.
In Cell N2 enter:
=IF(N2=1,1,0)
or
=IF(COUNT(IF(VALUE(MID($J$2:$J$12,FIND(",",$J$2:$J$12)+1,256))=L2,$E$2:$E$12))=1,1,0)
This formula is also an array formula.
See image for reference: