Robin,
I'm sure you'll get other type solutions which will be anycase less complicated. Here is mine though: a system of formulas that does what you want.
I'll assume that your example data
{"LABEL","MIN","MAX";"abcd",45.2,98.2;"abcd",40.6,74.2;"abcd",55,101.4;"efg",2.35,5.4;"efg",3.8,4.9;"efg",1.6,3.96}
occupy A1:C7.
Enter the following labels in E from E2 on:
{"Count";"LabelList";"MinList";"MaxList";"LocList";"SortList";"NoDupsList"}
In F2 enter: =COUNTA(A:A)
In F3 enter: =ADDRESS(ROW(A2),COLUMN(A2))&":"&ADDRESS(F2,COLUMN(A2))
In F4 enter: =ADDRESS(ROW(B2),COLUMN(B2))&":"&ADDRESS(F2,COLUMN(B2))
In F5 enter: =ADDRESS(ROW(C2),COLUMN(C2))&":"&ADDRESS(F2,COLUMN(C2))
In F6 enter: =ADDRESS(ROW(G2),COLUMN(G2))&":"&ADDRESS(F2,COLUMN(G2))
In F7 enter: =ADDRESS(ROW(H2),COLUMN(H2))&":"&ADDRESS(F2,COLUMN(H2))
In F8 enter: =ADDRESS(ROW(I2),COLUMN(I2))&":"&ADDRESS(F2,COLUMN(I2))
In G2 array-enter: =IF(ROW()-1<=$F$2,SUM(IF(A2>INDIRECT($F$3),1),1),"")
Copy down this array-formula as far as needed.
In H2 enter: =IF(ROW()-1<=$F$2,IF(ISNUMBER(MATCH(ROW()-ROW($G$2)+1,INDIRECT($F$6),0)),INDEX(INDIRECT($F$3),MATCH(ROW()-ROW($G$2)+1,INDIRECT($F$6),0)),0),"")
Copy down this formula as far as needed.
In E2 array-enter: =IF(ROW()-ROW(INDIRECT($F$8))+1>ROWS(INDIRECT($F$7))-COUNTIF(INDIRECT($F$7),0),"",INDIRECT(ADDRESS(SMALL((IF(INDIRECT($F$7)<>0,ROW(INDIRECT($F$7)),ROW()+ROWS(INDIRECT($F$7)))),ROW()-ROW(INDIRECT($F$8))+1),COLUMN(INDIRECT($F$7)))))
Copy down this array-formula as far as needed.
In J2 array-enter: =IF(LEN(I2)>0,MIN(IF(INDIRECT($F$3)=I2,INDIRECT($F$4))),"")
Copy down this array-formula as far as needed.
In K2 array-enter: =IF(LEN(I2)>0,MAX(IF(INDIRECT($F$3)=I2,INDIRECT($F$5))),"")
Copy down this array-formula as far as needed.
Note. To array-enter a formula, you need to hit CONTROL+SHIFT+ENTER at the same time, not just ENTER.
Here is how the sheet looks like from E1 to H8:
{0,0,0,0;"Count",7,1,"abcd";"LabelList","$A$2:$A$7",1,0;"MinList","$B$2:$B$7",1,0;"MaxList","$C$2:$C$7",4,"efg";"LocList","$G$2:$G$7",4,0;"SortList","$H$2:$H$7",4,0;"NoDupsList","$I$2:$I$7",1,0}
Here the results section from I to K:
{"LABEL","MIN","MAX";"abcd",40.6,101.4;"efg",1.6,5.4}
Aladin