[R] Help summarizing R data frame

chris99 cheakes at hotmail.com
Thu Dec 2 17:24:23 CET 2010


I am trying to aggregate data in column 2 to identifiers in col 1

eg..

take this>

identifier       quantity
1                     10
1                     20
2                     30
1                     15
2                     10
3                     20

and make this>

identifier         quantity
1                    45
2                    40
3                    20


Thanks in advance for your help!
-- 
View this message in context: http://r.789695.n4.nabble.com/Help-summarizing-R-data-frame-tp3069624p3069624.html
Sent from the R help mailing list archive at Nabble.com.



More information about the R-help mailing list