I think I got it, I post it here see if you have better way, please let me
know.
index <- rep(0, length(mydata[,1]))
index[as.Date(mydata3$Date) < as.Date("2006-11-30 23:29:29 PM") &
as.Date(mydata3$Date) > as.Date("2006-09-01 00:00:00 AM")] <- 1
index[as.Date(mydata3$Date) < as.Date("2007-11-30 23:29:29 PM") &
as.Date(mydata3$Date) > as.Date("2007-09-01 00:00:00 AM")] <- 1
index[as.Date(mydata3$Date) < as.Date("2008-11-30 23:29:29 PM") &
as.Date(mydata3$Date) > as.Date("2008-09-01 00:00:00 AM")] <- 1
index[as.Date(mydata3$Date) < as.Date("2009-11-30 23:29:29 PM") &
as.Date(mydata3$Date) > as.Date("2009-09-01 00:00:00 AM")] <- 1
index[as.Date(mydata3$Date) < as.Date("2010-11-30 23:29:29 PM") &
as.Date(mydata3$Date) > as.Date("2010-09-01 00:00:00 AM")] <- 1
Thanks
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