How do I check for duplicate rows and do calculate on that rows in excel file? -

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i have 1 excel file having data following

cusip   quantity  date           price af0      500000   5/6/2013      1 ae4      400000   5/6/2013      1.0825 ae4      500      5/6/2013      1

i need check column cusip , date if i'm having duplicate cusip same date need following calculation.

1.need add quantity both of them instead of showing duplicate records need show 1 record( sum of quantity).

2.need calculation on price following 

newprice = ((400000 * 1.0825) + (500 * 1.00))/(400000 + 500) = 1.08148

for example in using above data need show output 

cusip   quantity  date          price af0     500000    5/6/2013      1 ae4     400500    5/6/2013      1.082397004

how achieve in excel file using lookup or else ?

okay, after quite research (interesting question way!), came this:

=if(countif($a$2:a2,a2)>1,"",sumif(a:a,a2,b:b)) =if(countif($a$2:a2,a2)>1,"",sumproduct(--(a:a=a2),b:b,d:d)/sumif(a:a,a2,b:b))

put these in cell d2 , e2 respectively (which next column after price , in row of cusip af0).

and fill bottom of worksheet weighted average price or each cusip.

the first formula gives total quantity cusip , second gives average price.

copy , paste values 2 columns after calculation.

put filter , remove rows total quantity , average price blank, , sort make worksheet neat.

let me know if works you! tried on sample data , seems working. it's first time using sumproduct ^^;

sumproduct(--(a:a=a2)

this bit returns rows column equals row's cusip.

sumproduct(--(a:a=a2),b:b,d:d

this additional bit tells excel multiply values in column b , d of each returned row found above , sumproduct adds each result together.

edit: forgot date. maybe add helper column you'll generate identifier separate different dates. make it, you'll have make concatenate.

hence in cell f2, put:

 =concatenate(a2,c2)

in formulae cells d2 , e2, have change them become:

=if(countif($f$2:f2,f2)>1,"",sumif(a:a,a2,b:b)) =if(countif($f$2:f2,f2)>1,"",sumproduct(--(a:a=a2),b:b,d:d)/sumif(a:a,a2,b:b))

reedit: oops, put wrong reference. fixed now.


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