D2: =A2-DAY(A2)+1
D3: =IF(ISERROR(MATCH(0,COUNTIF(D$2:D2,($A$2:$A$20-DAY($A$2:$A$20)+1)&”"),0)),”",
INDEX(IF(ISBLANK($A$2:$A$20),”",$A$2:$A$20-DAY($A$2:$A$20)+1),MATCH(0,COUNTIF(D$2:D2,($A$2:$A$20-DAY($A$2:$A$20)+1)&”"),0)))

D3 is an array formula, copy down as far as you need

E2: =INDEX(Driver,MODE(IF(date-DAY(date)+1=D2,MATCH(Driver,Driver,0))))

also an array formula, copy down as far as Column D goes

Normally I’d also use a PivotTable, but if case sensitivity, white spaces, or mis-spelt strings need matching then the addin provides flexibility to cater for this

Cheers

Dave

=INDEX(Driver,MODE(IF(–TEXT(Date,”yyyy-mm-1″)=D2,MATCH(Driver,Driver,0))))

where D2=month (eg May-08), Date=a2:a13, Driver=b2:b13.
The new MODE.MULT function could be put to use for the multiple driver case maybe?

The Top 1 will then work correctly

But that was not listed as part of the question. It seems that it would take VBA and multiple cells to pull off multiple max’s.

Enter formula in C3: =MONTH(A2)
Drag C3 down

Enter headings on D2 and E2 of April and May

Enter formula in D2: =COUNTIFS($C$2:$C$13,”4?,$B$2:$B$13,$B2)
Drag D2 down

Enter formula in D14: =INDEX($B2:$B13,MATCH(MAX(D2:D13),D2:D13,0),1)

Drag D2:D14 over

[is there a way to post screen shots in comments? do i need to upload the pic somewhere else first?]

I added more data to Tammy’s original– some dates for Jan & Feb. The results, using a Sum array formula, is this for each person: (Table A)

12345
Mike21035
Andy30010
Tammy04010
Sam00010
Jerry11001

(the top row are the # values for the month).

Now, to match the max for each month to the person who acheived it.
Table B- these are my results. Column 3 produces the name using excel functions
Month #Max #Name
13Andy
24Tammy
30Mike
43Mike
55Mike

The first column are the month values again. The second column uses this Max array formula to find the max: {=MAX(IF($F$1:$J$1=$E10,$F$2:$J$6))}

The third column uses Match to first find the correct column in Table A for the month from column 1 in Table B; then Match (along with the offset for the # I just got) to identify which row of Table A the max value from Column 2 Table B is in. Finally, those 2 numbers give the parameters by which to identify the name using the Index function.

=OFFSET($E$1,MATCH($F10,OFFSET($E$2:$E$6,,MATCH($E10,$F$1:$J$1,0),,),0),,,)

Here’s another way with worksheet formulas.

1. Figure out all of the unique names in the list. Do this by choosing Data > Filter > Advanced Filter. Choose “Copy to another location” and check “Unique records only”.

2. Next to the filtered list of names (suppose they start in D2), enter the following formula in E2 and then fill down:

=COUNTIF($B$2:$B$13,”=”&D2)

That will be equivalent to evaluating

E2 =COUNTIF($B$2:$B$13,”=Andy”)
E3 =COUNTIF($B$2:$B$13,”=Jerry”)
etc.

The comparison will treat both “andy” and “Andy” as the same; i.e. it is not case sensitive. But an extra trailing space will cause trouble. E.g. if the cell’s text is really “Andy “, then Andy-space will look a different entry from “Andy”.