Count duplicate values in a sequence

Question

How can I count duplicate data in a column using excel?

Example

  A     B
apple   1
apple   2
apple   3
ball    1
bat     1
dog     1
do         


        

Answer 1

I think there is no uniform formula for all cells in your case.

I would suggest something like this: Put this on B column and then fill down the rest.

=COUNTIF($A$1:$A1,$A1)

After you fill the other rows, values of rows would look like this

B1=COUNTIF($A$1:$A1,$A1)
B2=COUNTIF($A$1:$A2,$A2)
B3=COUNTIF($A$1:$A3,$A3)