Dig deeper. -- Bert
Bert Gunter Genentech Nonclinical Biostatistics (650) 467-7374 "Data is not information. Information is not knowledge. And knowledge is certainly not wisdom." Clifford Stoll On Thu, Feb 26, 2015 at 8:29 AM, Mikael Olai Milhøj <mikaelmil...@gmail.com> wrote: > Hi. > > First of all, thx. But when using in arima(...xreg=fact,...) then fact > should be a vector and not a factor variable? Maybe I should have been more > clear in my first mail, sorry. Or else I have to dig deeper into factors. > > > /Mikael > > On Thu, Feb 26, 2015 at 5:17 PM, Bert Gunter <gunter.ber...@gene.com> wrote: >> >> Inline. >> >> Cheers, >> Bert >> >> Bert Gunter >> Genentech Nonclinical Biostatistics >> (650) 467-7374 >> >> "Data is not information. Information is not knowledge. And knowledge >> is certainly not wisdom." >> Clifford Stoll >> >> >> >> >> On Thu, Feb 26, 2015 at 8:02 AM, Mikael Olai Milhøj >> <mikaelmil...@gmail.com> wrote: >> > Hi all >> > >> > I have been searching on the web in vain. I want to include a dummy >> > variable in my ARIMA model. Let's say that I want to make an AR(1) model >> > for X including a dummy variable which should be 1 for observation 4,5,6 >> > and zero otherwise (let's say that there is 50 observations in total). >> > How >> > do I make that? >> >> You don't, really. >> >> 1. Go through an R tutorial so that you understand the concept of >> factors and how they are used in R modeling. >> >> 2. fact <- factor( (1:50) %in% (4:6)) >> >> Cheers, >> Bert >> >> > >> > This does the trick but seems inefficient: dummy<-c(rep(0,3), rep(1,3), >> > rep(0,44)) >> > >> > Thx in advance >> > >> > Best regards >> > /Mikael >> > >> > [[alternative HTML version deleted]] >> > >> > ______________________________________________ >> > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see >> > https://stat.ethz.ch/mailman/listinfo/r-help >> > PLEASE do read the posting guide >> > http://www.R-project.org/posting-guide.html >> > and provide commented, minimal, self-contained, reproducible code. > > ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
