[R] Creating a new by variable in a dataframe

ramoss ramine.mossadegh at finra.org
Fri Oct 19 22:09:07 CEST 2012

Thanks for all the help guys.

This worked for me:

all6 <- arrange(all6, tdate,event_tim)
lt <- ddply(all6,.(tdate),tail,1) 
lt$last_trans <-'Y'
all6 <-merge(all6,lt, by.x=c("tdate","event_tim"),

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