Sequentially Count Duplicates In List

Oct 2, 2008

I am trying to work out how I can assign a sequential value to sets of duplicate data within a list. i.e. where I have duplicates in a list I want each of the duplicates (that are in the same set) to have a sequential number assigned and for that to start from 1 each time it discovers a new set of duplicates.

RED
GREEN
YELLOW
PURPLE
RED
ORANGE
BLACK
GREEN
RED

Where a colour is duplicated in the list I want it to have a sequential number assigned. When a new set of duplicates is found the numbering starts from 1 and sequentially increases. So the above data list would resulting in the following output

RED 1
GREEN 1
YELLOW
PURPLE
RED 2
ORANGE
BLACK
GREEN 2
RED 3

Have tried variations of the RANK function, but not sure how to get the sequential nu,bering to restart with each unique set of duplicates. I would also like to do this without VBA if possible using the built in functions.

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I am having trouble creating a function to count duplicates of duplicates.

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Product 1 2nd
Product 1 2nd
Product 1 New
Product 1 New
Product 1 Flt
Product 2 2nd
Product 2 New
Product 2 New
Product 2 Flt
Product 2 Flt
Product 3 2nd
Product 3 2nd
Product 3 2nd
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New 2nd Flt
Product 1 XX XX XX
Product 2 XX XX XX
Product 3 XX XX XX

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I am using Windows 7 and MS Office 2010.

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Column B

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I know this all sounds a bit blurry, so let me attempt to make it more concrete.

Author Title Year Rating Type Desired outcome
P Marx I 2005 I A I Book I duplicate
A Hegel I 1923 I B I Article I -
B Kant I 1674 I D I Book I -
A Derrida I 2005 I D I Monograph............................

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a
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Good Morning Peps (Oh thats for users in Western Europe, got to get this right!)

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ERROR#9 OUT:

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