[R] Creating a variable which is the sum of equal rows in a dataframe
Cecilia Carmo
cecilia.carmo at ua.pt
Mon May 4 13:19:15 CEST 2009
Hi everyone:
I need to count the number of banks of each firm in my
data. The firm is identified by the fiscal number. The
banks of each firm appears like this:
Firm Banks
500600700 Citybank
500600700 CGD
500600700 BES
500600800 Citybank
500600800 Bank1
500600900 CGD
I want to obtain the following dataframe:
Firm numberofbanks
500600700 3
500600800 2
500600900 1
This is a question of counting the times each firm
appears, but I don’t know which function do this. If
anyone could help me I appreciate.
Thank you in advance for the help you could give me,
Cecilia Carmo (Portugal)
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