search for: fcul

...s described in Ljung and Box (1978) paper? Note: this issue was discussed in http://tolstoy.newcastle.edu.au/R/help/06/03/22768.html (and thread) but it seems with little consensus. Thanks in advance, Nuno ______________________________________________ Centro de Oceanografia - IO-FCUL, Portugal Center for Quantitative Fisheries Ecology - ODU, USA [[alternative HTML version deleted]]

...max(AirPassengers+500)), ylab="") par(new=T) monthplot(AirPassengers, col="blue", ylim=c(min(AirPassengers), max(AirPassengers+500)), ylab="") Greetings from Norfolk, Nuno Prista ______________________________________________ Instituto de Oceanografia - FCUL, Portugal Center for Quantitative Fisheries Ecology - ODU, USA [[alternative HTML version deleted]]

Dear colleagues, Can anyone of you tell me how to write a "nabla" symbol in an R graph? Thanks in advance, Nuno ______________________________________________ Centro de Oceanografia - IO-FCUL, Portugal Center for Quantitative Fisheries Ecology - ODU, USA [[alternative HTML version deleted]]

...colleagues, ?arima? returns directly the 1-step ahead errors but I am interested in obtaining other h-step ahead errors for several ARIMA models I have fitted. Is there any way I can obtain this with R? Any help would be appreciated. Sincerely, Nuno Prista _________________________ CO - FCUL, Lisboa, Portugal CQFE - ODU, Norfolk, USA

...has period 6 and shows its periodicity in 1/6 and harmonics. In the second series I was expecting to see a signal occurring at frequency 1/5 but it does not. Can anybody explain me why? Thanks in advance, Nuno ______________________________________________ Centro de Oceanografia - IO-FCUL, Portugal Center for Quantitative Fisheries Ecology - ODU, USA email: nmprista*@fc.ul.pt ; nprista*@odu.edu [[alternative HTML version deleted]]

...eems to be based on all a[t]. I made a fe more tests and the number of residuals which appear (to me) miss-calculated gets larger and larger when I test q>1. Can I trust the "arima" estimates in the MA case as I do in the AR case? Thanks, Nuno Prista _________________________ CO - FCUL, Lisboa, Portugal CQFE - ODU, Norfolk, USA