adding a column representing the sequence of duplicates in a specific column

[iestat]

Hi Guys!

I have a variable (column) named ID and there are some duplicates therein. I want to add a new column showing the sequence of duplicates in ID. For example if we have three values of 10 in a line for ID consecutively, there should be 1, 2, and 3 for the new SEQ column respectively. Attached you can easily see what I mean to do. How could it be done?

Thanks!

[benishiryo]

hi iestat. you can try this:
=COUNTIF($A$2:A2,A2)

[MarvinP]

Hi iestat,

As benishiryo suggested correctly.. here is the attached example of what he did.

[iestat]

Thanks so much you both Guys!

[Cutter]

@ iestat

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