# forecast backward in time

If I have Time series from 1960 to 2018 and i want to forecast data befor 1960, How I can do it in R?

• I'm mot saying this is the best way, but how about reversing the order of the time series and forecasting into the future of the reversed time series? – Mark L. Stone Apr 3 '18 at 16:58
• There might be some logical cut-off point for the past. Like the AirPassengers dataset in R, it would be meaningless to predict before 1903. I say this because it seems like you data set is close to 0 around the beginning. Is there a true 0 point for your variable? – Jay Schyler Raadt Apr 3 '18 at 17:17
• Ok, if my data is AirPassengers dataset in R,how to predict before 1903? – duaa Apr 3 '18 at 17:59
• stats.stackexchange.com/questions/190807/… suggests that you do exactly what Mark l Stone stated. – IrishStat Apr 3 '18 at 20:05
• For some code showing how to do it in R, see otexts.org/fpp2/backcasting.html – Rob Hyndman Apr 3 '18 at 22:16