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...ime to create 24 hr time is as follows: addTime2<-function(timeTxt,mins){ orig.date<-as.POSIXct(paste("2001-01-01",timeTxt)) new.Date<-orig.date+mins*60 new.Date<-strsplit(as.character(new.Date)," ") new.Time<-(sapply(new.Date,"[",2)) return(new.Time) } SCHEDULE2$DEPART<-addTime2(SCHEDULE2$ARRIVE,SCHEDULE2$WAIT) (code courtesy of Gustaf) Thank you, Mike -------------- next part -------------- A non-text attachment was scrubbed... Name: Dataframe.pdf Type: application/pdf Size: 101190 bytes Desc: Dataframe.pdf URL: <https://stat.ethz.ch/pipermail/r-h...

...eate 'DEPART', which will then be combined with 'TRAVEL' (minutes) to yield the 'ARRIVE' time of line 3, etc. This series of calc's will start anew beginning at each unique 'MM' by 'DD' grouping. Any advice would be greatly appreciated. Thank you, Mike SCHEDULE2 <- structure(list(MM = c("05", "05", "05", "05", "05", "05", "05", "05", "05", "05", "05", "05", "05", "05", "05", "05", "05",...