Hi everyone,
I want to calculate the cumulative frequency of firms which have different identifiers and appear in different Date.
For example:
Date Company Cumulative freq
01/01/2011 A 1
02/02/2011 B 1
05/02/2011 A 2
09/12/2012 C 1
09/01/2013 B 2
10/01/2013 A 3
15/01/2013 B 3
15/01/2013 D 1
Can any one help me with this?

Thanks in advance!

Kind regards,

Loc